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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_PUBLIC_CHILD_CHILD_THREAD_H_
#define CONTENT_PUBLIC_CHILD_CHILD_THREAD_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "build/build_config.h"
#include "content/common/content_export.h"
#include "ipc/ipc_sender.h"
#include "mojo/public/cpp/bindings/generic_pending_receiver.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#endif
namespace base {
class SingleThreadTaskRunner;
struct UserMetricsAction;
}
namespace content {
// An abstract base class that contains logic shared between most child
// processes of the embedder.
class CONTENT_EXPORT ChildThread : public IPC::Sender {
public:
// Returns the one child thread for this process. Note that this can only be
// accessed when running on the child thread itself.
static ChildThread* Get();
~ChildThread() override {}
// Sends over a base::UserMetricsAction to be recorded by user metrics as
// an action. Once a new user metric is added, run
// tools/metrics/actions/extract_actions.py
// to add the metric to actions.xml, then update the <owner>s and
// <description> sections. Make sure to include the actions.xml file when you
// upload your code for review!
//
// WARNING: When using base::UserMetricsAction, base::UserMetricsAction
// and a string literal parameter must be on the same line, e.g.
// RenderThread::Get()->RecordAction(
// base::UserMetricsAction("my extremely long action name"));
// because otherwise our processing scripts won't pick up on new actions.
virtual void RecordAction(const base::UserMetricsAction& action) = 0;
// Sends over a string to be recorded by user metrics as a computed action.
// When you use this you need to also update the rules for extracting known
// actions in chrome/tools/extract_actions.py.
virtual void RecordComputedAction(const std::string& action) = 0;
// Asks the browser-side process host object to bind |receiver|. Whether or
// not the interface type encapsulated by |receiver| is supported depends on
// the process type and potentially on the Content embedder.
//
// Receivers passed into this method arrive in the browser process and are
// taken through one of the following flows, stopping if any step decides to
// bind the receiver:
//
// For renderers:
// 1. IO thread, IOThreadHostImpl::BindHostReceiver.
// 2. Main thread, RenderProcessHostImpl::BindHostReceiver.
// 3. Main thread, ContentBrowserClient::BindHostReceiverForRenderer.
//
// TODO(crbug.com/977637): Document behavior for other process types when
// their support is added.
virtual void BindHostReceiver(mojo::GenericPendingReceiver receiver) = 0;
virtual scoped_refptr<base::SingleThreadTaskRunner> GetIOTaskRunner() = 0;
// Tells the child process that a field trial was activated.
virtual void SetFieldTrialGroup(const std::string& trial_name,
const std::string& group_name) = 0;
#if BUILDFLAG(IS_WIN)
// Request that the given font be loaded by the browser so it's cached by the
// OS. Please see ChildProcessHost::PreCacheFont for details.
virtual void PreCacheFont(const LOGFONT& log_font) = 0;
// Release cached font.
virtual void ReleaseCachedFonts() = 0;
#endif
};
} // namespace content
#endif // CONTENT_PUBLIC_CHILD_CHILD_THREAD_H_