blob: 2f3d30fec89808943e435051a06ba91c59e6dab2 [file] [log] [blame]
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/memory/ref_counted.h"
#include "ipc/ipc_channel_proxy.h"
namespace base {
class SingleThreadTaskRunner;
namespace content {
class ResourceDispatcher;
// Supplies ResourceDispatcher with timestamps for some resource messages.
// Background: ResourceDispatcher converts browser process time to child
// process time. This is done to achieve coherent timeline. Conversion is
// a linear transformation such that given browser process time range is
// mapped to corresponding child process time range. Timestamps for child
// process time range should be taken by IO thread when resource messages
// arrive. Otherwise, timestamps may be affected by long rendering / JS task.
// When specific message is processed by this filter, new task charged
// with timestamp is posted to main thread. This task is processed just before
// resource message and invokes ResourceDispatcher::set_io_timestamp.
class ChildResourceMessageFilter : public IPC::ChannelProxy::MessageFilter {
explicit ChildResourceMessageFilter(ResourceDispatcher* resource_dispatcher);
// IPC::ChannelProxy::MessageFilter implementation.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
virtual ~ChildResourceMessageFilter();
scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
ResourceDispatcher* resource_dispatcher_;
} // namespace content