gpu/command_buffer/service/shared_image/shared_image_manager.cc - chromium/src.git - Git at Google

 // Copyright 2018 The Chromium Authors
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "gpu/command_buffer/service/shared_image/shared_image_manager.h"

 #include <inttypes.h>

 #include <memory>
 #include <utility>

 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "components/viz/common/resources/resource_format_utils.h"
 #include "gpu/command_buffer/common/shared_image_trace_utils.h"
 #include "gpu/command_buffer/service/shared_context_state.h"
 #include "gpu/command_buffer/service/shared_image/shared_image_representation.h"
 #include "ui/gl/trace_util.h"

 #if BUILDFLAG(IS_WIN)
 #include "gpu/command_buffer/service/dxgi_shared_handle_manager.h"
 #include "ui/gl/gl_angle_util_win.h"
 #endif

 #if DCHECK_IS_ON()
 #define CALLED_ON_VALID_THREAD()                      \
   do {                                                \
     if (!this->is_thread_safe())                      \
       DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); \
   } while (false)
 #else
 #define CALLED_ON_VALID_THREAD()
 #endif

 namespace gpu {
 // Overrides for flat_set lookups:
 bool operator<(const std::unique_ptr<SharedImageBacking>& lhs,
                const std::unique_ptr<SharedImageBacking>& rhs) {
   return lhs->mailbox() < rhs->mailbox();
 }

 bool operator<(const Mailbox& lhs,
                const std::unique_ptr<SharedImageBacking>& rhs) {
   return lhs < rhs->mailbox();
 }

 bool operator<(const std::unique_ptr<SharedImageBacking>& lhs,
                const Mailbox& rhs) {
   return lhs->mailbox() < rhs;
 }

 class SCOPED_LOCKABLE SharedImageManager::AutoLock {
  public:
   explicit AutoLock(SharedImageManager* manager)
       EXCLUSIVE_LOCK_FUNCTION(manager->lock_)
       : auto_lock_(manager->is_thread_safe() ? &manager->lock_.value()
                                              : nullptr) {}

   AutoLock(const AutoLock&) = delete;
   AutoLock& operator=(const AutoLock&) = delete;

   ~AutoLock() UNLOCK_FUNCTION() = default;

  private:
   base::AutoLockMaybe auto_lock_;
 };

 SharedImageManager::SharedImageManager(bool thread_safe,
                                        bool display_context_on_another_thread)
     : display_context_on_another_thread_(display_context_on_another_thread) {
   DCHECK(!display_context_on_another_thread || thread_safe);
   if (thread_safe)
     lock_.emplace();
 #if BUILDFLAG(IS_WIN)
   auto d3d11_device = gl::QueryD3D11DeviceObjectFromANGLE();
   if (d3d11_device) {
     dxgi_shared_handle_manager_ =
         base::MakeRefCounted<DXGISharedHandleManager>(std::move(d3d11_device));
   }
 #endif
   CALLED_ON_VALID_THREAD();
 }

 SharedImageManager::~SharedImageManager() {
   CALLED_ON_VALID_THREAD();
 #if DCHECK_IS_ON()
   AutoLock auto_lock(this);
 #endif
   DCHECK(images_.empty());
 }

 std::unique_ptr<SharedImageRepresentationFactoryRef>
 SharedImageManager::Register(std::unique_ptr<SharedImageBacking> backing,
                              MemoryTypeTracker* tracker) {
   CALLED_ON_VALID_THREAD();
   DCHECK(backing->mailbox().IsSharedImage());

   AutoLock autolock(this);
   if (images_.find(backing->mailbox()) != images_.end()) {
     LOG(ERROR) << "SharedImageManager::Register: Trying to register an "
                   "already registered mailbox.";
     return nullptr;
   }

   // TODO(jonross): Determine how the direct destruction of a
   // SharedImageRepresentationFactoryRef leads to ref-counting issues as
   // well as thread-checking failures in tests.
   auto factory_ref = std::make_unique<SharedImageRepresentationFactoryRef>(
       this, backing.get(), tracker);
   images_.emplace(std::move(backing));

   return factory_ref;
 }

 void SharedImageManager::OnContextLost(const Mailbox& mailbox) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::OnContextLost: Trying to mark constext "
                   "lost on a non existent mailbox.";
     return;
   }
   (*found)->OnContextLost();
 }

 std::unique_ptr<GLTextureImageRepresentation>
 SharedImageManager::ProduceGLTexture(const Mailbox& mailbox,
                                      MemoryTypeTracker* tracker) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::ProduceGLTexture: Trying to produce a "
                   "representation from a non-existent mailbox. "
                << mailbox.ToDebugString();
     return nullptr;
   }

   auto representation = (*found)->ProduceGLTexture(this, tracker);
   if (!representation) {
     LOG(ERROR) << "SharedImageManager::ProduceGLTexture: Trying to produce a "
                   "representation from an incompatible mailbox.";
     return nullptr;
   }

   return representation;
 }

 std::unique_ptr<GLTexturePassthroughImageRepresentation>
 SharedImageManager::ProduceGLTexturePassthrough(const Mailbox& mailbox,
                                                 MemoryTypeTracker* tracker) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::ProduceGLTexturePassthrough: Trying to "
                   "produce a representation from a non-existent mailbox.";
     return nullptr;
   }

   auto representation = (*found)->ProduceGLTexturePassthrough(this, tracker);
   if (!representation) {
     LOG(ERROR) << "SharedImageManager::ProduceGLTexturePassthrough: Trying to "
                   "produce a representation from an incompatible mailbox.";
     return nullptr;
   }

   return representation;
 }

 std::unique_ptr<SkiaImageRepresentation> SharedImageManager::ProduceSkia(
     const Mailbox& mailbox,
     MemoryTypeTracker* tracker,
     scoped_refptr<SharedContextState> context_state) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::ProduceSkia: Trying to Produce a "
                   "Skia representation from a non-existent mailbox.";
     return nullptr;
   }

   auto representation = (*found)->ProduceSkia(this, tracker, context_state);
   if (!representation) {
     LOG(ERROR) << "SharedImageManager::ProduceSkia: Trying to produce a "
                   "Skia representation from an incompatible mailbox.";
     return nullptr;
   }

   return representation;
 }

 std::unique_ptr<DawnImageRepresentation> SharedImageManager::ProduceDawn(
     const Mailbox& mailbox,
     MemoryTypeTracker* tracker,
     WGPUDevice device,
     WGPUBackendType backend_type) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::ProduceDawn: Trying to Produce a "
                   "Dawn representation from a non-existent mailbox.";
     return nullptr;
   }

   auto representation =
       (*found)->ProduceDawn(this, tracker, device, backend_type);
   if (!representation) {
     LOG(ERROR) << "SharedImageManager::ProduceDawn: Trying to produce a "
                   "Dawn representation from an incompatible mailbox.";
     return nullptr;
   }

   return representation;
 }

 std::unique_ptr<OverlayImageRepresentation> SharedImageManager::ProduceOverlay(
     const gpu::Mailbox& mailbox,
     gpu::MemoryTypeTracker* tracker) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::ProduceOverlay: Trying to Produce a "
                   "Overlay representation from a non-existent mailbox.";
     return nullptr;
   }

   auto representation = (*found)->ProduceOverlay(this, tracker);
   if (!representation) {
     LOG(ERROR) << "SharedImageManager::ProduceOverlay: Trying to produce a "
                   "Overlay representation from an incompatible mailbox.";
     return nullptr;
   }

   return representation;
 }

 std::unique_ptr<VaapiImageRepresentation> SharedImageManager::ProduceVASurface(
     const Mailbox& mailbox,
     MemoryTypeTracker* tracker,
     VaapiDependenciesFactory* dep_factory) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::ProduceVASurface: Trying to produce a "
                   "VA-API representation from a non-existent mailbox.";
     return nullptr;
   }

   auto representation = (*found)->ProduceVASurface(this, tracker, dep_factory);

   if (!representation) {
     LOG(ERROR) << "SharedImageManager::ProduceVASurface: Trying to produce a "
                   "VA-API representation from an incompatible mailbox.";
     return nullptr;
   }
   return representation;
 }

 std::unique_ptr<MemoryImageRepresentation> SharedImageManager::ProduceMemory(
     const Mailbox& mailbox,
     MemoryTypeTracker* tracker) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::ProduceMemory: Trying to Produce a "
                   "Memory representation from a non-existent mailbox.";
     return nullptr;
   }

   // This is expected to fail based on the SharedImageBacking type, so don't log
   // error here. Caller is expected to handle nullptr.
   return (*found)->ProduceMemory(this, tracker);
 }

 std::unique_ptr<RasterImageRepresentation> SharedImageManager::ProduceRaster(
     const Mailbox& mailbox,
     MemoryTypeTracker* tracker) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::ProduceRaster: Trying to Produce a "
                   "Raster representation from a non-existent mailbox.";
     return nullptr;
   }

   // This is expected to fail based on the SharedImageBacking type, so don't log
   // error here. Caller is expected to handle nullptr.
   return (*found)->ProduceRaster(this, tracker);
 }

 #if BUILDFLAG(IS_ANDROID)
 std::unique_ptr<LegacyOverlayImageRepresentation>
 SharedImageManager::ProduceLegacyOverlay(const Mailbox& mailbox,
                                          MemoryTypeTracker* tracker) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR)
         << "SharedImageManager::ProduceLegacyOverlay: Trying to Produce a "
            "Legacy Overlay representation from a non-existent mailbox.";
     return nullptr;
   }

   auto representation = (*found)->ProduceLegacyOverlay(this, tracker);
   if (!representation) {
     LOG(ERROR)
         << "SharedImageManager::ProduceLegacyOverlay: Trying to produce a "
            "Legacy Overlay representation from an incompatible mailbox.";
     return nullptr;
   }

   return representation;
 }
 #endif

 void SharedImageManager::OnRepresentationDestroyed(
     const Mailbox& mailbox,
     SharedImageRepresentation* representation) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);

   {
     auto found = images_.find(mailbox);
     if (found == images_.end()) {
       LOG(ERROR) << "SharedImageManager::OnRepresentationDestroyed: Trying to "
                     "destroy a non existent mailbox.";
       return;
     }

     // TODO(piman): When the original (factory) representation is destroyed, we
     // should treat the backing as pending destruction and prevent additional
     // representations from being created. This will help avoid races due to a
     // consumer getting lucky with timing due to a representation inadvertently
     // extending a backing's lifetime.
     (*found)->ReleaseRef(representation);
   }

   {
     // TODO(jonross): Once the pending destruction TODO above is addressed then
     // this block can be removed, and the deletion can occur directly. Currently
     // SharedImageManager::OnRepresentationDestroyed can be nested, so we need
     // to get the iterator again.
     auto found = images_.find(mailbox);
     if (found != images_.end() && (!(*found)->HasAnyRefs()))
       images_.erase(found);
   }
 }

 void SharedImageManager::OnMemoryDump(const Mailbox& mailbox,
                                       base::trace_event::ProcessMemoryDump* pmd,
                                       const std::string& dump_base_name,
                                       uint64_t client_tracing_id) {
   CALLED_ON_VALID_THREAD();

   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end()) {
     LOG(ERROR) << "SharedImageManager::OnMemoryDump: Trying to dump memory for "
                   "a non existent mailbox.";
     return;
   }

   auto* backing = found->get();
   size_t estimated_size = backing->EstimatedSizeForMemTracking();
   if (estimated_size == 0)
     return;

   // Unique name in the process.
   std::string dump_name = base::StringPrintf(
       "%s/mailbox_%s", dump_base_name.c_str(), mailbox.ToDebugString().c_str());

   // GUID which expresses shared ownership with the client process. This must
   // match the client-side GUID for mailbox.
   auto client_guid = GetSharedImageGUIDForTracing(backing->mailbox());

   // Backing will produce dump with relevant information along with ownership
   // edge to `client_guid`.
   backing->OnMemoryDump(dump_name, client_guid, pmd, client_tracing_id);
 }

 scoped_refptr<gfx::NativePixmap> SharedImageManager::GetNativePixmap(
     const gpu::Mailbox& mailbox) {
   AutoLock autolock(this);
   auto found = images_.find(mailbox);
   if (found == images_.end())
     return nullptr;
   return (*found)->GetNativePixmap();
 }

 }  // namespace gpu
	// Copyright 2018 The Chromium Authors
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "gpu/command_buffer/service/shared_image/shared_image_manager.h"

	#include <inttypes.h>

	#include <memory>
	#include <utility>

	#include "base/logging.h"
	#include "base/metrics/histogram_macros.h"
	#include "base/strings/stringprintf.h"
	#include "base/trace_event/memory_dump_manager.h"
	#include "base/trace_event/process_memory_dump.h"
	#include "base/trace_event/trace_event.h"
	#include "build/build_config.h"
	#include "components/viz/common/resources/resource_format_utils.h"
	#include "gpu/command_buffer/common/shared_image_trace_utils.h"
	#include "gpu/command_buffer/service/shared_context_state.h"
	#include "gpu/command_buffer/service/shared_image/shared_image_representation.h"
	#include "ui/gl/trace_util.h"

	#if BUILDFLAG(IS_WIN)
	#include "gpu/command_buffer/service/dxgi_shared_handle_manager.h"
	#include "ui/gl/gl_angle_util_win.h"
	#endif

	#if DCHECK_IS_ON()
	#define CALLED_ON_VALID_THREAD() \
	do { \
	if (!this->is_thread_safe()) \
	DCHECK_CALLED_ON_VALID_THREAD(thread_checker_); \
	} while (false)
	#else
	#define CALLED_ON_VALID_THREAD()
	#endif

	namespace gpu {
	// Overrides for flat_set lookups:
	bool operator<(const std::unique_ptr<SharedImageBacking>& lhs,
	const std::unique_ptr<SharedImageBacking>& rhs) {
	return lhs->mailbox() < rhs->mailbox();
	}

	bool operator<(const Mailbox& lhs,
	const std::unique_ptr<SharedImageBacking>& rhs) {
	return lhs < rhs->mailbox();
	}

	bool operator<(const std::unique_ptr<SharedImageBacking>& lhs,
	const Mailbox& rhs) {
	return lhs->mailbox() < rhs;
	}

	class SCOPED_LOCKABLE SharedImageManager::AutoLock {
	public:
	explicit AutoLock(SharedImageManager* manager)
	EXCLUSIVE_LOCK_FUNCTION(manager->lock_)
	: auto_lock_(manager->is_thread_safe() ? &manager->lock_.value()
	: nullptr) {}

	AutoLock(const AutoLock&) = delete;
	AutoLock& operator=(const AutoLock&) = delete;

	~AutoLock() UNLOCK_FUNCTION() = default;

	private:
	base::AutoLockMaybe auto_lock_;
	};

	SharedImageManager::SharedImageManager(bool thread_safe,
	bool display_context_on_another_thread)
	: display_context_on_another_thread_(display_context_on_another_thread) {
	DCHECK(!display_context_on_another_thread \|\| thread_safe);
	if (thread_safe)
	lock_.emplace();
	#if BUILDFLAG(IS_WIN)
	auto d3d11_device = gl::QueryD3D11DeviceObjectFromANGLE();
	if (d3d11_device) {
	dxgi_shared_handle_manager_ =
	base::MakeRefCounted<DXGISharedHandleManager>(std::move(d3d11_device));
	}
	#endif
	CALLED_ON_VALID_THREAD();
	}

	SharedImageManager::~SharedImageManager() {
	CALLED_ON_VALID_THREAD();
	#if DCHECK_IS_ON()
	AutoLock auto_lock(this);
	#endif
	DCHECK(images_.empty());
	}

	std::unique_ptr<SharedImageRepresentationFactoryRef>
	SharedImageManager::Register(std::unique_ptr<SharedImageBacking> backing,
	MemoryTypeTracker* tracker) {
	CALLED_ON_VALID_THREAD();
	DCHECK(backing->mailbox().IsSharedImage());

	AutoLock autolock(this);
	if (images_.find(backing->mailbox()) != images_.end()) {
	LOG(ERROR) << "SharedImageManager::Register: Trying to register an "
	"already registered mailbox.";
	return nullptr;
	}

	// TODO(jonross): Determine how the direct destruction of a
	// SharedImageRepresentationFactoryRef leads to ref-counting issues as
	// well as thread-checking failures in tests.
	auto factory_ref = std::make_unique<SharedImageRepresentationFactoryRef>(
	this, backing.get(), tracker);
	images_.emplace(std::move(backing));

	return factory_ref;
	}

	void SharedImageManager::OnContextLost(const Mailbox& mailbox) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::OnContextLost: Trying to mark constext "
	"lost on a non existent mailbox.";
	return;
	}
	(*found)->OnContextLost();
	}

	std::unique_ptr<GLTextureImageRepresentation>
	SharedImageManager::ProduceGLTexture(const Mailbox& mailbox,
	MemoryTypeTracker* tracker) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::ProduceGLTexture: Trying to produce a "
	"representation from a non-existent mailbox. "
	<< mailbox.ToDebugString();
	return nullptr;
	}

	auto representation = (*found)->ProduceGLTexture(this, tracker);
	if (!representation) {
	LOG(ERROR) << "SharedImageManager::ProduceGLTexture: Trying to produce a "
	"representation from an incompatible mailbox.";
	return nullptr;
	}

	return representation;
	}

	std::unique_ptr<GLTexturePassthroughImageRepresentation>
	SharedImageManager::ProduceGLTexturePassthrough(const Mailbox& mailbox,
	MemoryTypeTracker* tracker) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::ProduceGLTexturePassthrough: Trying to "
	"produce a representation from a non-existent mailbox.";
	return nullptr;
	}

	auto representation = (*found)->ProduceGLTexturePassthrough(this, tracker);
	if (!representation) {
	LOG(ERROR) << "SharedImageManager::ProduceGLTexturePassthrough: Trying to "
	"produce a representation from an incompatible mailbox.";
	return nullptr;
	}

	return representation;
	}

	std::unique_ptr<SkiaImageRepresentation> SharedImageManager::ProduceSkia(
	const Mailbox& mailbox,
	MemoryTypeTracker* tracker,
	scoped_refptr<SharedContextState> context_state) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::ProduceSkia: Trying to Produce a "
	"Skia representation from a non-existent mailbox.";
	return nullptr;
	}

	auto representation = (*found)->ProduceSkia(this, tracker, context_state);
	if (!representation) {
	LOG(ERROR) << "SharedImageManager::ProduceSkia: Trying to produce a "
	"Skia representation from an incompatible mailbox.";
	return nullptr;
	}

	return representation;
	}

	std::unique_ptr<DawnImageRepresentation> SharedImageManager::ProduceDawn(
	const Mailbox& mailbox,
	MemoryTypeTracker* tracker,
	WGPUDevice device,
	WGPUBackendType backend_type) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::ProduceDawn: Trying to Produce a "
	"Dawn representation from a non-existent mailbox.";
	return nullptr;
	}

	auto representation =
	(*found)->ProduceDawn(this, tracker, device, backend_type);
	if (!representation) {
	LOG(ERROR) << "SharedImageManager::ProduceDawn: Trying to produce a "
	"Dawn representation from an incompatible mailbox.";
	return nullptr;
	}

	return representation;
	}

	std::unique_ptr<OverlayImageRepresentation> SharedImageManager::ProduceOverlay(
	const gpu::Mailbox& mailbox,
	gpu::MemoryTypeTracker* tracker) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::ProduceOverlay: Trying to Produce a "
	"Overlay representation from a non-existent mailbox.";
	return nullptr;
	}

	auto representation = (*found)->ProduceOverlay(this, tracker);
	if (!representation) {
	LOG(ERROR) << "SharedImageManager::ProduceOverlay: Trying to produce a "
	"Overlay representation from an incompatible mailbox.";
	return nullptr;
	}

	return representation;
	}

	std::unique_ptr<VaapiImageRepresentation> SharedImageManager::ProduceVASurface(
	const Mailbox& mailbox,
	MemoryTypeTracker* tracker,
	VaapiDependenciesFactory* dep_factory) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::ProduceVASurface: Trying to produce a "
	"VA-API representation from a non-existent mailbox.";
	return nullptr;
	}

	auto representation = (*found)->ProduceVASurface(this, tracker, dep_factory);

	if (!representation) {
	LOG(ERROR) << "SharedImageManager::ProduceVASurface: Trying to produce a "
	"VA-API representation from an incompatible mailbox.";
	return nullptr;
	}
	return representation;
	}

	std::unique_ptr<MemoryImageRepresentation> SharedImageManager::ProduceMemory(
	const Mailbox& mailbox,
	MemoryTypeTracker* tracker) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::ProduceMemory: Trying to Produce a "
	"Memory representation from a non-existent mailbox.";
	return nullptr;
	}

	// This is expected to fail based on the SharedImageBacking type, so don't log
	// error here. Caller is expected to handle nullptr.
	return (*found)->ProduceMemory(this, tracker);
	}

	std::unique_ptr<RasterImageRepresentation> SharedImageManager::ProduceRaster(
	const Mailbox& mailbox,
	MemoryTypeTracker* tracker) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::ProduceRaster: Trying to Produce a "
	"Raster representation from a non-existent mailbox.";
	return nullptr;
	}

	// This is expected to fail based on the SharedImageBacking type, so don't log
	// error here. Caller is expected to handle nullptr.
	return (*found)->ProduceRaster(this, tracker);
	}

	#if BUILDFLAG(IS_ANDROID)
	std::unique_ptr<LegacyOverlayImageRepresentation>
	SharedImageManager::ProduceLegacyOverlay(const Mailbox& mailbox,
	MemoryTypeTracker* tracker) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR)
	<< "SharedImageManager::ProduceLegacyOverlay: Trying to Produce a "
	"Legacy Overlay representation from a non-existent mailbox.";
	return nullptr;
	}

	auto representation = (*found)->ProduceLegacyOverlay(this, tracker);
	if (!representation) {
	LOG(ERROR)
	<< "SharedImageManager::ProduceLegacyOverlay: Trying to produce a "
	"Legacy Overlay representation from an incompatible mailbox.";
	return nullptr;
	}

	return representation;
	}
	#endif

	void SharedImageManager::OnRepresentationDestroyed(
	const Mailbox& mailbox,
	SharedImageRepresentation* representation) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);

	{
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::OnRepresentationDestroyed: Trying to "
	"destroy a non existent mailbox.";
	return;
	}

	// TODO(piman): When the original (factory) representation is destroyed, we
	// should treat the backing as pending destruction and prevent additional
	// representations from being created. This will help avoid races due to a
	// consumer getting lucky with timing due to a representation inadvertently
	// extending a backing's lifetime.
	(*found)->ReleaseRef(representation);
	}

	{
	// TODO(jonross): Once the pending destruction TODO above is addressed then
	// this block can be removed, and the deletion can occur directly. Currently
	// SharedImageManager::OnRepresentationDestroyed can be nested, so we need
	// to get the iterator again.
	auto found = images_.find(mailbox);
	if (found != images_.end() && (!(*found)->HasAnyRefs()))
	images_.erase(found);
	}
	}

	void SharedImageManager::OnMemoryDump(const Mailbox& mailbox,
	base::trace_event::ProcessMemoryDump* pmd,
	const std::string& dump_base_name,
	uint64_t client_tracing_id) {
	CALLED_ON_VALID_THREAD();

	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end()) {
	LOG(ERROR) << "SharedImageManager::OnMemoryDump: Trying to dump memory for "
	"a non existent mailbox.";
	return;
	}

	auto* backing = found->get();
	size_t estimated_size = backing->EstimatedSizeForMemTracking();
	if (estimated_size == 0)
	return;

	// Unique name in the process.
	std::string dump_name = base::StringPrintf(
	"%s/mailbox_%s", dump_base_name.c_str(), mailbox.ToDebugString().c_str());

	// GUID which expresses shared ownership with the client process. This must
	// match the client-side GUID for mailbox.
	auto client_guid = GetSharedImageGUIDForTracing(backing->mailbox());

	// Backing will produce dump with relevant information along with ownership
	// edge to `client_guid`.
	backing->OnMemoryDump(dump_name, client_guid, pmd, client_tracing_id);
	}

	scoped_refptr<gfx::NativePixmap> SharedImageManager::GetNativePixmap(
	const gpu::Mailbox& mailbox) {
	AutoLock autolock(this);
	auto found = images_.find(mailbox);
	if (found == images_.end())
	return nullptr;
	return (*found)->GetNativePixmap();
	}

	} // namespace gpu