Refactor content/common/gpu into gpu/ipc/service

content/common/gpu/gpu_channel.cc

Index: content/common/gpu/gpu_channel.cc
diff --git a/content/common/gpu/gpu_channel.cc b/content/common/gpu/gpu_channel.cc
deleted file mode 100644
index 20edeafa8467e1ad4f42da2350c052003e8be2a6..0000000000000000000000000000000000000000
--- a/content/common/gpu/gpu_channel.cc
+++ /dev/null
@@ -1,1072 +0,0 @@
-// Copyright (c) 2012 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 "content/common/gpu/gpu_channel.h"
-
-#include <utility>
-
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
-
-#include <algorithm>
-#include <deque>
-#include <set>
-#include <vector>
-
-#include "base/atomicops.h"
-#include "base/bind.h"
-#include "base/command_line.h"
-#include "base/location.h"
-#include "base/numerics/safe_conversions.h"
-#include "base/single_thread_task_runner.h"
-#include "base/stl_util.h"
-#include "base/strings/string_util.h"
-#include "base/synchronization/lock.h"
-#include "base/thread_task_runner_handle.h"
-#include "base/timer/timer.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 "content/common/gpu/gpu_channel_manager.h"
-#include "content/common/gpu/gpu_channel_manager_delegate.h"
-#include "content/common/gpu/gpu_memory_buffer_factory.h"
-#include "gpu/command_buffer/common/mailbox.h"
-#include "gpu/command_buffer/common/value_state.h"
-#include "gpu/command_buffer/service/command_executor.h"
-#include "gpu/command_buffer/service/image_factory.h"
-#include "gpu/command_buffer/service/mailbox_manager.h"
-#include "gpu/command_buffer/service/sync_point_manager.h"
-#include "gpu/command_buffer/service/valuebuffer_manager.h"
-#include "gpu/ipc/common/gpu_messages.h"
-#include "ipc/ipc_channel.h"
-#include "ipc/message_filter.h"
-#include "ui/gl/gl_context.h"
-#include "ui/gl/gl_image_shared_memory.h"
-#include "ui/gl/gl_surface.h"
-
-#if defined(OS_POSIX)
-#include "ipc/ipc_channel_posix.h"
-#endif
-
-namespace content {
-namespace {
-
-// Number of milliseconds between successive vsync. Many GL commands block
-// on vsync, so thresholds for preemption should be multiples of this.
-const int64_t kVsyncIntervalMs = 17;
-
-// Amount of time that we will wait for an IPC to be processed before
-// preempting. After a preemption, we must wait this long before triggering
-// another preemption.
-const int64_t kPreemptWaitTimeMs = 2 * kVsyncIntervalMs;
-
-// Once we trigger a preemption, the maximum duration that we will wait
-// before clearing the preemption.
-const int64_t kMaxPreemptTimeMs = kVsyncIntervalMs;
-
-// Stop the preemption once the time for the longest pending IPC drops
-// below this threshold.
-const int64_t kStopPreemptThresholdMs = kVsyncIntervalMs;
-
-}  // anonymous namespace
-
-scoped_refptr<GpuChannelMessageQueue> GpuChannelMessageQueue::Create(
-    int32_t stream_id,
-    gpu::GpuStreamPriority stream_priority,
-    GpuChannel* channel,
-    const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
-    const scoped_refptr<gpu::PreemptionFlag>& preempting_flag,
-    const scoped_refptr<gpu::PreemptionFlag>& preempted_flag,
-    gpu::SyncPointManager* sync_point_manager) {
-  return new GpuChannelMessageQueue(stream_id, stream_priority, channel,
-                                    io_task_runner, preempting_flag,
-                                    preempted_flag, sync_point_manager);
-}
-
-scoped_refptr<gpu::SyncPointOrderData>
-GpuChannelMessageQueue::GetSyncPointOrderData() {
-  return sync_point_order_data_;
-}
-
-GpuChannelMessageQueue::GpuChannelMessageQueue(
-    int32_t stream_id,
-    gpu::GpuStreamPriority stream_priority,
-    GpuChannel* channel,
-    const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
-    const scoped_refptr<gpu::PreemptionFlag>& preempting_flag,
-    const scoped_refptr<gpu::PreemptionFlag>& preempted_flag,
-    gpu::SyncPointManager* sync_point_manager)
-    : stream_id_(stream_id),
-      stream_priority_(stream_priority),
-      enabled_(true),
-      scheduled_(true),
-      channel_(channel),
-      preemption_state_(IDLE),
-      max_preemption_time_(
-          base::TimeDelta::FromMilliseconds(kMaxPreemptTimeMs)),
-      timer_(new base::OneShotTimer),
-      sync_point_order_data_(gpu::SyncPointOrderData::Create()),
-      io_task_runner_(io_task_runner),
-      preempting_flag_(preempting_flag),
-      preempted_flag_(preempted_flag),
-      sync_point_manager_(sync_point_manager) {
-  timer_->SetTaskRunner(io_task_runner);
-  io_thread_checker_.DetachFromThread();
-}
-
-GpuChannelMessageQueue::~GpuChannelMessageQueue() {
-  DCHECK(!enabled_);
-  DCHECK(channel_messages_.empty());
-}
-
-void GpuChannelMessageQueue::Disable() {
-  {
-    base::AutoLock auto_lock(channel_lock_);
-    DCHECK(enabled_);
-    enabled_ = false;
-  }
-
-  // We guarantee that the queues will no longer be modified after enabled_
-  // is set to false, it is now safe to modify the queue without the lock.
-  // All public facing modifying functions check enabled_ while all
-  // private modifying functions DCHECK(enabled_) to enforce this.
-  while (!channel_messages_.empty()) {
-    const IPC::Message& msg = channel_messages_.front()->message;
-    if (msg.is_sync()) {
-      IPC::Message* reply = IPC::SyncMessage::GenerateReply(&msg);
-      reply->set_reply_error();
-      channel_->Send(reply);
-    }
-    channel_messages_.pop_front();
-  }
-
-  sync_point_order_data_->Destroy();
-  sync_point_order_data_ = nullptr;
-
-  io_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&GpuChannelMessageQueue::DisableIO, this));
-}
-
-void GpuChannelMessageQueue::DisableIO() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  timer_ = nullptr;
-}
-
-bool GpuChannelMessageQueue::IsScheduled() const {
-  base::AutoLock lock(channel_lock_);
-  return scheduled_;
-}
-
-void GpuChannelMessageQueue::OnRescheduled(bool scheduled) {
-  base::AutoLock lock(channel_lock_);
-  DCHECK(enabled_);
-  if (scheduled_ == scheduled)
-    return;
-  scheduled_ = scheduled;
-  if (scheduled)
-    channel_->PostHandleMessage(this);
-  if (preempting_flag_) {
-    io_task_runner_->PostTask(
-        FROM_HERE,
-        base::Bind(&GpuChannelMessageQueue::UpdatePreemptionState, this));
-  }
-}
-
-uint32_t GpuChannelMessageQueue::GetUnprocessedOrderNum() const {
-  return sync_point_order_data_->unprocessed_order_num();
-}
-
-uint32_t GpuChannelMessageQueue::GetProcessedOrderNum() const {
-  return sync_point_order_data_->processed_order_num();
-}
-
-bool GpuChannelMessageQueue::PushBackMessage(const IPC::Message& message) {
-  base::AutoLock auto_lock(channel_lock_);
-  if (enabled_) {
-    if (message.type() == GpuCommandBufferMsg_WaitForTokenInRange::ID ||
-        message.type() == GpuCommandBufferMsg_WaitForGetOffsetInRange::ID) {
-      channel_->PostHandleOutOfOrderMessage(message);
-      return true;
-    }
-
-    uint32_t order_num = sync_point_order_data_->GenerateUnprocessedOrderNumber(
-        sync_point_manager_);
-    scoped_ptr<GpuChannelMessage> msg(
-        new GpuChannelMessage(message, order_num, base::TimeTicks::Now()));
-
-    if (channel_messages_.empty()) {
-      DCHECK(scheduled_);
-      channel_->PostHandleMessage(this);
-    }
-
-    channel_messages_.push_back(std::move(msg));
-
-    if (preempting_flag_)
-      UpdatePreemptionStateHelper();
-
-    return true;
-  }
-  return false;
-}
-
-const GpuChannelMessage* GpuChannelMessageQueue::BeginMessageProcessing() {
-  base::AutoLock auto_lock(channel_lock_);
-  DCHECK(enabled_);
-  // If we have been preempted by another channel, just post a task to wake up.
-  if (preempted_flag_ && preempted_flag_->IsSet()) {
-    channel_->PostHandleMessage(this);
-    return nullptr;
-  }
-  if (channel_messages_.empty())
-    return nullptr;
-  sync_point_order_data_->BeginProcessingOrderNumber(
-      channel_messages_.front()->order_number);
-  return channel_messages_.front().get();
-}
-
-void GpuChannelMessageQueue::PauseMessageProcessing() {
-  base::AutoLock auto_lock(channel_lock_);
-  DCHECK(!channel_messages_.empty());
-
-  // If we have been preempted by another channel, just post a task to wake up.
-  if (scheduled_)
-    channel_->PostHandleMessage(this);
-
-  sync_point_order_data_->PauseProcessingOrderNumber(
-      channel_messages_.front()->order_number);
-}
-
-void GpuChannelMessageQueue::FinishMessageProcessing() {
-  base::AutoLock auto_lock(channel_lock_);
-  DCHECK(!channel_messages_.empty());
-  DCHECK(scheduled_);
-
-  sync_point_order_data_->FinishProcessingOrderNumber(
-      channel_messages_.front()->order_number);
-  channel_messages_.pop_front();
-
-  if (!channel_messages_.empty())
-    channel_->PostHandleMessage(this);
-
-  if (preempting_flag_) {
-    io_task_runner_->PostTask(
-        FROM_HERE,
-        base::Bind(&GpuChannelMessageQueue::UpdatePreemptionState, this));
-  }
-}
-
-void GpuChannelMessageQueue::UpdatePreemptionState() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  base::AutoLock lock(channel_lock_);
-  UpdatePreemptionStateHelper();
-}
-
-void GpuChannelMessageQueue::UpdatePreemptionStateHelper() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  switch (preemption_state_) {
-    case IDLE:
-      UpdateStateIdle();
-      break;
-    case WAITING:
-      UpdateStateWaiting();
-      break;
-    case CHECKING:
-      UpdateStateChecking();
-      break;
-    case PREEMPTING:
-      UpdateStatePreempting();
-      break;
-    case WOULD_PREEMPT_DESCHEDULED:
-      UpdateStateWouldPreemptDescheduled();
-      break;
-    default:
-      NOTREACHED();
-  }
-}
-
-void GpuChannelMessageQueue::UpdateStateIdle() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  DCHECK(!timer_->IsRunning());
-  if (!channel_messages_.empty())
-    TransitionToWaiting();
-}
-
-void GpuChannelMessageQueue::UpdateStateWaiting() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  // Transition to CHECKING if timer fired.
-  if (!timer_->IsRunning())
-    TransitionToChecking();
-}
-
-void GpuChannelMessageQueue::UpdateStateChecking() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  if (!channel_messages_.empty()) {
-    base::TimeTicks time_recv = channel_messages_.front()->time_received;
-    base::TimeDelta time_elapsed = base::TimeTicks::Now() - time_recv;
-    if (time_elapsed.InMilliseconds() < kPreemptWaitTimeMs) {
-      // Schedule another check for when the IPC may go long.
-      timer_->Start(
-          FROM_HERE,
-          base::TimeDelta::FromMilliseconds(kPreemptWaitTimeMs) - time_elapsed,
-          this, &GpuChannelMessageQueue::UpdatePreemptionState);
-    } else {
-      timer_->Stop();
-      if (!scheduled_)
-        TransitionToWouldPreemptDescheduled();
-      else
-        TransitionToPreempting();
-    }
-  }
-}
-
-void GpuChannelMessageQueue::UpdateStatePreempting() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  // We should stop preempting if the timer fired or for other conditions.
-  if (!timer_->IsRunning() || ShouldTransitionToIdle()) {
-    TransitionToIdle();
-  } else if (!scheduled_) {
-    // Save the remaining preemption time before stopping the timer.
-    max_preemption_time_ = timer_->desired_run_time() - base::TimeTicks::Now();
-    timer_->Stop();
-    TransitionToWouldPreemptDescheduled();
-  }
-}
-
-void GpuChannelMessageQueue::UpdateStateWouldPreemptDescheduled() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  DCHECK(!timer_->IsRunning());
-  if (ShouldTransitionToIdle()) {
-    TransitionToIdle();
-  } else if (scheduled_) {
-    TransitionToPreempting();
-  }
-}
-
-bool GpuChannelMessageQueue::ShouldTransitionToIdle() const {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  DCHECK(preemption_state_ == PREEMPTING ||
-         preemption_state_ == WOULD_PREEMPT_DESCHEDULED);
-  if (channel_messages_.empty()) {
-    return true;
-  } else {
-    base::TimeTicks next_tick = channel_messages_.front()->time_received;
-    base::TimeDelta time_elapsed = base::TimeTicks::Now() - next_tick;
-    if (time_elapsed.InMilliseconds() < kStopPreemptThresholdMs)
-      return true;
-  }
-  return false;
-}
-
-void GpuChannelMessageQueue::TransitionToIdle() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  DCHECK(preemption_state_ == PREEMPTING ||
-         preemption_state_ == WOULD_PREEMPT_DESCHEDULED);
-
-  preemption_state_ = IDLE;
-  preempting_flag_->Reset();
-
-  max_preemption_time_ = base::TimeDelta::FromMilliseconds(kMaxPreemptTimeMs);
-  timer_->Stop();
-
-  TRACE_COUNTER_ID1("gpu", "GpuChannel::Preempting", this, 0);
-
-  UpdateStateIdle();
-}
-
-void GpuChannelMessageQueue::TransitionToWaiting() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  DCHECK_EQ(preemption_state_, IDLE);
-  DCHECK(!timer_->IsRunning());
-
-  preemption_state_ = WAITING;
-
-  timer_->Start(FROM_HERE,
-                base::TimeDelta::FromMilliseconds(kPreemptWaitTimeMs), this,
-                &GpuChannelMessageQueue::UpdatePreemptionState);
-}
-
-void GpuChannelMessageQueue::TransitionToChecking() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  DCHECK_EQ(preemption_state_, WAITING);
-  DCHECK(!timer_->IsRunning());
-
-  preemption_state_ = CHECKING;
-
-  UpdateStateChecking();
-}
-
-void GpuChannelMessageQueue::TransitionToPreempting() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  DCHECK(preemption_state_ == CHECKING ||
-         preemption_state_ == WOULD_PREEMPT_DESCHEDULED);
-  DCHECK(scheduled_);
-
-  preemption_state_ = PREEMPTING;
-  preempting_flag_->Set();
-  TRACE_COUNTER_ID1("gpu", "GpuChannel::Preempting", this, 1);
-
-  DCHECK_LE(max_preemption_time_,
-            base::TimeDelta::FromMilliseconds(kMaxPreemptTimeMs));
-  timer_->Start(FROM_HERE, max_preemption_time_, this,
-                &GpuChannelMessageQueue::UpdatePreemptionState);
-}
-
-void GpuChannelMessageQueue::TransitionToWouldPreemptDescheduled() {
-  DCHECK(io_thread_checker_.CalledOnValidThread());
-  DCHECK(preempting_flag_);
-  channel_lock_.AssertAcquired();
-  DCHECK(preemption_state_ == CHECKING || preemption_state_ == PREEMPTING);
-  DCHECK(!scheduled_);
-
-  preemption_state_ = WOULD_PREEMPT_DESCHEDULED;
-  preempting_flag_->Reset();
-  TRACE_COUNTER_ID1("gpu", "GpuChannel::Preempting", this, 0);
-}
-
-GpuChannelMessageFilter::GpuChannelMessageFilter()
-    : sender_(nullptr), peer_pid_(base::kNullProcessId) {}
-
-GpuChannelMessageFilter::~GpuChannelMessageFilter() {}
-
-void GpuChannelMessageFilter::OnFilterAdded(IPC::Sender* sender) {
-  DCHECK(!sender_);
-  sender_ = sender;
-  for (scoped_refptr<IPC::MessageFilter>& filter : channel_filters_) {
-    filter->OnFilterAdded(sender_);
-  }
-}
-
-void GpuChannelMessageFilter::OnFilterRemoved() {
-  DCHECK(sender_);
-  for (scoped_refptr<IPC::MessageFilter>& filter : channel_filters_) {
-    filter->OnFilterRemoved();
-  }
-  sender_ = nullptr;
-  peer_pid_ = base::kNullProcessId;
-}
-
-void GpuChannelMessageFilter::OnChannelConnected(int32_t peer_pid) {
-  DCHECK(peer_pid_ == base::kNullProcessId);
-  peer_pid_ = peer_pid;
-  for (scoped_refptr<IPC::MessageFilter>& filter : channel_filters_) {
-    filter->OnChannelConnected(peer_pid);
-  }
-}
-
-void GpuChannelMessageFilter::OnChannelError() {
-  for (scoped_refptr<IPC::MessageFilter>& filter : channel_filters_) {
-    filter->OnChannelError();
-  }
-}
-
-void GpuChannelMessageFilter::OnChannelClosing() {
-  for (scoped_refptr<IPC::MessageFilter>& filter : channel_filters_) {
-    filter->OnChannelClosing();
-  }
-}
-
-void GpuChannelMessageFilter::AddChannelFilter(
-    scoped_refptr<IPC::MessageFilter> filter) {
-  channel_filters_.push_back(filter);
-  if (sender_)
-    filter->OnFilterAdded(sender_);
-  if (peer_pid_ != base::kNullProcessId)
-    filter->OnChannelConnected(peer_pid_);
-}
-
-void GpuChannelMessageFilter::RemoveChannelFilter(
-    scoped_refptr<IPC::MessageFilter> filter) {
-  if (sender_)
-    filter->OnFilterRemoved();
-  channel_filters_.erase(
-      std::find(channel_filters_.begin(), channel_filters_.end(), filter));
-}
-
-// This gets called from the main thread and assumes that all messages which
-// lead to creation of a new route are synchronous messages.
-// TODO(sunnyps): Create routes (and streams) on the IO thread so that we can
-// make the CreateCommandBuffer/VideoDecoder/VideoEncoder messages asynchronous.
-void GpuChannelMessageFilter::AddRoute(
-    int32_t route_id,
-    const scoped_refptr<GpuChannelMessageQueue>& queue) {
-  base::AutoLock lock(routes_lock_);
-  routes_.insert(std::make_pair(route_id, queue));
-}
-
-void GpuChannelMessageFilter::RemoveRoute(int32_t route_id) {
-  base::AutoLock lock(routes_lock_);
-  routes_.erase(route_id);
-}
-
-bool GpuChannelMessageFilter::OnMessageReceived(const IPC::Message& message) {
-  DCHECK(sender_);
-
-  if (message.should_unblock() || message.is_reply())
-    return MessageErrorHandler(message, "Unexpected message type");
-
-  if (message.type() == GpuChannelMsg_Nop::ID) {
-    IPC::Message* reply = IPC::SyncMessage::GenerateReply(&message);
-    Send(reply);
-    return true;
-  }
-
-  for (scoped_refptr<IPC::MessageFilter>& filter : channel_filters_) {
-    if (filter->OnMessageReceived(message))
-      return true;
-  }
-
-  scoped_refptr<GpuChannelMessageQueue> message_queue =
-      LookupStreamByRoute(message.routing_id());
-
-  if (!message_queue)
-    return MessageErrorHandler(message, "Could not find message queue");
-
-  if (!message_queue->PushBackMessage(message))
-    return MessageErrorHandler(message, "Channel destroyed");
-
-  return true;
-}
-
-bool GpuChannelMessageFilter::Send(IPC::Message* message) {
-  return sender_->Send(message);
-}
-
-scoped_refptr<GpuChannelMessageQueue>
-GpuChannelMessageFilter::LookupStreamByRoute(int32_t route_id) {
-  base::AutoLock lock(routes_lock_);
-  auto it = routes_.find(route_id);
-  if (it != routes_.end())
-    return it->second;
-  return nullptr;
-}
-
-bool GpuChannelMessageFilter::MessageErrorHandler(const IPC::Message& message,
-                                                  const char* error_msg) {
-  DLOG(ERROR) << error_msg;
-  if (message.is_sync()) {
-    IPC::Message* reply = IPC::SyncMessage::GenerateReply(&message);
-    reply->set_reply_error();
-    Send(reply);
-  }
-  return true;
-}
-
-GpuChannel::GpuChannel(GpuChannelManager* gpu_channel_manager,
-                       gpu::SyncPointManager* sync_point_manager,
-                       GpuWatchdog* watchdog,
-                       gfx::GLShareGroup* share_group,
-                       gpu::gles2::MailboxManager* mailbox,
-                       gpu::PreemptionFlag* preempting_flag,
-                       gpu::PreemptionFlag* preempted_flag,
-                       base::SingleThreadTaskRunner* task_runner,
-                       base::SingleThreadTaskRunner* io_task_runner,
-                       int32_t client_id,
-                       uint64_t client_tracing_id,
-                       bool allow_view_command_buffers,
-                       bool allow_real_time_streams)
-    : gpu_channel_manager_(gpu_channel_manager),
-      sync_point_manager_(sync_point_manager),
-      unhandled_message_listener_(nullptr),
-      channel_id_(IPC::Channel::GenerateVerifiedChannelID("gpu")),
-      preempting_flag_(preempting_flag),
-      preempted_flag_(preempted_flag),
-      client_id_(client_id),
-      client_tracing_id_(client_tracing_id),
-      task_runner_(task_runner),
-      io_task_runner_(io_task_runner),
-      share_group_(share_group),
-      mailbox_manager_(mailbox),
-      subscription_ref_set_(new gpu::gles2::SubscriptionRefSet),
-      pending_valuebuffer_state_(new gpu::ValueStateMap),
-      watchdog_(watchdog),
-      allow_view_command_buffers_(allow_view_command_buffers),
-      allow_real_time_streams_(allow_real_time_streams),
-      weak_factory_(this) {
-  DCHECK(gpu_channel_manager);
-  DCHECK(client_id);
-
-  filter_ = new GpuChannelMessageFilter();
-
-  scoped_refptr<GpuChannelMessageQueue> control_queue =
-      CreateStream(gpu::GPU_STREAM_DEFAULT, gpu::GpuStreamPriority::HIGH);
-  AddRouteToStream(MSG_ROUTING_CONTROL, gpu::GPU_STREAM_DEFAULT);
-
-  subscription_ref_set_->AddObserver(this);
-}
-
-GpuChannel::~GpuChannel() {
-  // Clear stubs first because of dependencies.
-  stubs_.clear();
-
-  for (auto& kv : streams_)
-    kv.second->Disable();
-
-  subscription_ref_set_->RemoveObserver(this);
-  if (preempting_flag_.get())
-    preempting_flag_->Reset();
-}
-
-IPC::ChannelHandle GpuChannel::Init(base::WaitableEvent* shutdown_event) {
-  DCHECK(shutdown_event);
-  DCHECK(!channel_);
-
-  IPC::ChannelHandle channel_handle(channel_id_);
-
-  channel_ =
-      IPC::SyncChannel::Create(channel_handle, IPC::Channel::MODE_SERVER, this,
-                               io_task_runner_, false, shutdown_event);
-
-#if defined(OS_POSIX)
-  // On POSIX, pass the renderer-side FD. Also mark it as auto-close so
-  // that it gets closed after it has been sent.
-  base::ScopedFD renderer_fd = channel_->TakeClientFileDescriptor();
-  DCHECK(renderer_fd.is_valid());
-  channel_handle.socket = base::FileDescriptor(std::move(renderer_fd));
-#endif
-
-  channel_->AddFilter(filter_.get());
-
-  return channel_handle;
-}
-
-void GpuChannel::SetUnhandledMessageListener(IPC::Listener* listener) {
-  unhandled_message_listener_ = listener;
-}
-
-base::WeakPtr<GpuChannel> GpuChannel::AsWeakPtr() {
-  return weak_factory_.GetWeakPtr();
-}
-
-base::ProcessId GpuChannel::GetClientPID() const {
-  return channel_->GetPeerPID();
-}
-
-uint32_t GpuChannel::GetProcessedOrderNum() const {
-  uint32_t processed_order_num = 0;
-  for (auto& kv : streams_) {
-    processed_order_num =
-        std::max(processed_order_num, kv.second->GetProcessedOrderNum());
-  }
-  return processed_order_num;
-}
-
-uint32_t GpuChannel::GetUnprocessedOrderNum() const {
-  uint32_t unprocessed_order_num = 0;
-  for (auto& kv : streams_) {
-    unprocessed_order_num =
-        std::max(unprocessed_order_num, kv.second->GetUnprocessedOrderNum());
-  }
-  return unprocessed_order_num;
-}
-
-bool GpuChannel::OnMessageReceived(const IPC::Message& msg) {
-  // All messages should be pushed to channel_messages_ and handled separately.
-  NOTREACHED();
-  return false;
-}
-
-void GpuChannel::OnChannelError() {
-  gpu_channel_manager_->RemoveChannel(client_id_);
-}
-
-bool GpuChannel::Send(IPC::Message* message) {
-  // The GPU process must never send a synchronous IPC message to the renderer
-  // process. This could result in deadlock.
-  DCHECK(!message->is_sync());
-
-  DVLOG(1) << "sending message @" << message << " on channel @" << this
-           << " with type " << message->type();
-
-  if (!channel_) {
-    delete message;
-    return false;
-  }
-
-  return channel_->Send(message);
-}
-
-void GpuChannel::OnAddSubscription(unsigned int target) {
-  gpu_channel_manager()->delegate()->AddSubscription(client_id_, target);
-}
-
-void GpuChannel::OnRemoveSubscription(unsigned int target) {
-  gpu_channel_manager()->delegate()->RemoveSubscription(client_id_, target);
-}
-
-void GpuChannel::OnStreamRescheduled(int32_t stream_id, bool scheduled) {
-  scoped_refptr<GpuChannelMessageQueue> queue = LookupStream(stream_id);
-  DCHECK(queue);
-  queue->OnRescheduled(scheduled);
-}
-
-GpuCommandBufferStub* GpuChannel::LookupCommandBuffer(int32_t route_id) {
-  return stubs_.get(route_id);
-}
-
-void GpuChannel::LoseAllContexts() {
-  gpu_channel_manager_->LoseAllContexts();
-}
-
-void GpuChannel::MarkAllContextsLost() {
-  for (auto& kv : stubs_)
-    kv.second->MarkContextLost();
-}
-
-bool GpuChannel::AddRoute(int32_t route_id,
-                          int32_t stream_id,
-                          IPC::Listener* listener) {
-  if (router_.AddRoute(route_id, listener)) {
-    AddRouteToStream(route_id, stream_id);
-    return true;
-  }
-  return false;
-}
-
-void GpuChannel::RemoveRoute(int32_t route_id) {
-  router_.RemoveRoute(route_id);
-  RemoveRouteFromStream(route_id);
-}
-
-bool GpuChannel::OnControlMessageReceived(const IPC::Message& msg) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(GpuChannel, msg)
-    IPC_MESSAGE_HANDLER(GpuChannelMsg_CreateCommandBuffer,
-                        OnCreateCommandBuffer)
-    IPC_MESSAGE_HANDLER(GpuChannelMsg_DestroyCommandBuffer,
-                        OnDestroyCommandBuffer)
-    IPC_MESSAGE_HANDLER(GpuChannelMsg_GetDriverBugWorkArounds,
-                        OnGetDriverBugWorkArounds)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-scoped_refptr<gpu::SyncPointOrderData> GpuChannel::GetSyncPointOrderData(
-    int32_t stream_id) {
-  auto it = streams_.find(stream_id);
-  DCHECK(it != streams_.end());
-  DCHECK(it->second);
-  return it->second->GetSyncPointOrderData();
-}
-
-void GpuChannel::PostHandleMessage(
-    const scoped_refptr<GpuChannelMessageQueue>& queue) {
-  task_runner_->PostTask(FROM_HERE,
-                         base::Bind(&GpuChannel::HandleMessage,
-                                    weak_factory_.GetWeakPtr(), queue));
-}
-
-void GpuChannel::PostHandleOutOfOrderMessage(const IPC::Message& msg) {
-  task_runner_->PostTask(FROM_HERE,
-                         base::Bind(&GpuChannel::HandleOutOfOrderMessage,
-                                    weak_factory_.GetWeakPtr(), msg));
-}
-
-void GpuChannel::HandleMessage(
-    const scoped_refptr<GpuChannelMessageQueue>& message_queue) {
-  const GpuChannelMessage* channel_msg =
-      message_queue->BeginMessageProcessing();
-  if (!channel_msg)
-    return;
-
-  const IPC::Message& msg = channel_msg->message;
-  int32_t routing_id = msg.routing_id();
-  GpuCommandBufferStub* stub = stubs_.get(routing_id);
-
-  DCHECK(!stub || stub->IsScheduled());
-
-  DVLOG(1) << "received message @" << &msg << " on channel @" << this
-           << " with type " << msg.type();
-
-  HandleMessageHelper(msg);
-
-  // If we get descheduled or yield while processing a message.
-  if (stub && stub->HasUnprocessedCommands()) {
-    DCHECK_EQ((uint32_t)GpuCommandBufferMsg_AsyncFlush::ID, msg.type());
-    message_queue->PauseMessageProcessing();
-  } else {
-    message_queue->FinishMessageProcessing();
-  }
-}
-
-void GpuChannel::HandleMessageHelper(const IPC::Message& msg) {
-  int32_t routing_id = msg.routing_id();
-
-  bool handled = false;
-  if (routing_id == MSG_ROUTING_CONTROL) {
-    handled = OnControlMessageReceived(msg);
-  } else {
-    handled = router_.RouteMessage(msg);
-  }
-
-  if (!handled && unhandled_message_listener_)
-    handled = unhandled_message_listener_->OnMessageReceived(msg);
-
-  // Respond to sync messages even if router failed to route.
-  if (!handled && msg.is_sync()) {
-    IPC::Message* reply = IPC::SyncMessage::GenerateReply(&msg);
-    reply->set_reply_error();
-    Send(reply);
-  }
-}
-
-void GpuChannel::HandleOutOfOrderMessage(const IPC::Message& msg) {
-  HandleMessageHelper(msg);
-}
-
-void GpuChannel::HandleMessageForTesting(const IPC::Message& msg) {
-  HandleMessageHelper(msg);
-}
-
-scoped_refptr<GpuChannelMessageQueue> GpuChannel::CreateStream(
-    int32_t stream_id,
-    gpu::GpuStreamPriority stream_priority) {
-  DCHECK(streams_.find(stream_id) == streams_.end());
-  scoped_refptr<GpuChannelMessageQueue> queue = GpuChannelMessageQueue::Create(
-      stream_id, stream_priority, this, io_task_runner_,
-      (stream_id == gpu::GPU_STREAM_DEFAULT) ? preempting_flag_ : nullptr,
-      preempted_flag_, sync_point_manager_);
-  streams_.insert(std::make_pair(stream_id, queue));
-  streams_to_num_routes_.insert(std::make_pair(stream_id, 0));
-  return queue;
-}
-
-scoped_refptr<GpuChannelMessageQueue> GpuChannel::LookupStream(
-    int32_t stream_id) {
-  auto stream_it = streams_.find(stream_id);
-  if (stream_it != streams_.end())
-    return stream_it->second;
-  return nullptr;
-}
-
-void GpuChannel::DestroyStreamIfNecessary(
-    const scoped_refptr<GpuChannelMessageQueue>& queue) {
-  int32_t stream_id = queue->stream_id();
-  if (streams_to_num_routes_[stream_id] == 0) {
-    queue->Disable();
-    streams_to_num_routes_.erase(stream_id);
-    streams_.erase(stream_id);
-  }
-}
-
-void GpuChannel::AddRouteToStream(int32_t route_id, int32_t stream_id) {
-  DCHECK(streams_.find(stream_id) != streams_.end());
-  DCHECK(routes_to_streams_.find(route_id) == routes_to_streams_.end());
-  streams_to_num_routes_[stream_id]++;
-  routes_to_streams_.insert(std::make_pair(route_id, stream_id));
-  filter_->AddRoute(route_id, streams_[stream_id]);
-}
-
-void GpuChannel::RemoveRouteFromStream(int32_t route_id) {
-  DCHECK(routes_to_streams_.find(route_id) != routes_to_streams_.end());
-  int32_t stream_id = routes_to_streams_[route_id];
-  DCHECK(streams_.find(stream_id) != streams_.end());
-  routes_to_streams_.erase(route_id);
-  streams_to_num_routes_[stream_id]--;
-  filter_->RemoveRoute(route_id);
-  DestroyStreamIfNecessary(streams_[stream_id]);
-}
-
-#if defined(OS_ANDROID)
-const GpuCommandBufferStub* GpuChannel::GetOneStub() const {
-  for (const auto& kv : stubs_) {
-    const GpuCommandBufferStub* stub = kv.second;
-    if (stub->decoder() && !stub->decoder()->WasContextLost())
-      return stub;
-  }
-  return nullptr;
-}
-#endif
-
-void GpuChannel::OnCreateCommandBuffer(
-    gpu::SurfaceHandle surface_handle,
-    const gfx::Size& size,
-    const GPUCreateCommandBufferConfig& init_params,
-    int32_t route_id,
-    bool* succeeded) {
-  TRACE_EVENT2("gpu", "GpuChannel::OnCreateCommandBuffer", "route_id", route_id,
-               "offscreen", (surface_handle == gpu::kNullSurfaceHandle));
-  *succeeded = false;
-  if (surface_handle != gpu::kNullSurfaceHandle &&
-      !allow_view_command_buffers_) {
-    DLOG(ERROR) << "GpuChannel::CreateCommandBuffer(): attempt to create a "
-                   "view context on a non-priviledged channel";
-    return;
-  }
-
-  int32_t share_group_id = init_params.share_group_id;
-  GpuCommandBufferStub* share_group = stubs_.get(share_group_id);
-
-  if (!share_group && share_group_id != MSG_ROUTING_NONE) {
-    DLOG(ERROR)
-        << "GpuChannel::OnCreateCommandBuffer(): invalid share group id";
-    return;
-  }
-
-  int32_t stream_id = init_params.stream_id;
-  if (share_group && stream_id != share_group->stream_id()) {
-    DLOG(ERROR) << "GpuChannel::OnCreateCommandBuffer(): stream id does not "
-                   "match share group stream id";
-    return;
-  }
-
-  gpu::GpuStreamPriority stream_priority = init_params.stream_priority;
-  if (!allow_real_time_streams_ &&
-      stream_priority == gpu::GpuStreamPriority::REAL_TIME) {
-    DLOG(ERROR) << "GpuChannel::OnCreateCommandBuffer(): real time stream "
-                   "priority not allowed";
-    return;
-  }
-
-  scoped_ptr<GpuCommandBufferStub> stub(new GpuCommandBufferStub(
-      this, sync_point_manager_, task_runner_.get(), share_group,
-      surface_handle, mailbox_manager_.get(), preempted_flag_.get(),
-      subscription_ref_set_.get(), pending_valuebuffer_state_.get(), size,
-      disallowed_features_, init_params.attribs, init_params.gpu_preference,
-      init_params.stream_id, route_id, watchdog_, init_params.active_url));
-
-  scoped_refptr<GpuChannelMessageQueue> queue = LookupStream(stream_id);
-  if (!queue)
-    queue = CreateStream(stream_id, stream_priority);
-
-  if (!AddRoute(route_id, stream_id, stub.get())) {
-    DestroyStreamIfNecessary(queue);
-    DLOG(ERROR) << "GpuChannel::OnCreateCommandBuffer(): failed to add route";
-    return;
-  }
-
-  stubs_.set(route_id, std::move(stub));
-  *succeeded = true;
-}
-
-void GpuChannel::OnDestroyCommandBuffer(int32_t route_id) {
-  TRACE_EVENT1("gpu", "GpuChannel::OnDestroyCommandBuffer",
-               "route_id", route_id);
-
-  scoped_ptr<GpuCommandBufferStub> stub = stubs_.take_and_erase(route_id);
-  // In case the renderer is currently blocked waiting for a sync reply from the
-  // stub, we need to make sure to reschedule the correct stream here.
-  if (stub && !stub->IsScheduled()) {
-    // This stub won't get a chance to reschedule the stream so do that now.
-    OnStreamRescheduled(stub->stream_id(), true);
-  }
-
-  RemoveRoute(route_id);
-}
-
-void GpuChannel::OnGetDriverBugWorkArounds(
-    std::vector<std::string>* gpu_driver_bug_workarounds) {
-  // TODO(j.isorce): http://crbug.com/599964 Do the extraction of workarounds in
-  // the GpuChannelManager constructor. Currently it is done in the FeatureInfo
-  // constructor. There is no need to extract them from the command-line every
-  // time a new FeatureInfo is created (i.e. per ContextGroup) since parsing
-  // result is a constant.
-  scoped_refptr<gpu::gles2::FeatureInfo> feature_info =
-      new gpu::gles2::FeatureInfo;
-  gpu_driver_bug_workarounds->clear();
-#define GPU_OP(type, name)              \
-  if (feature_info->workarounds().name) \
-    gpu_driver_bug_workarounds->push_back(#name);
-  GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
-#undef GPU_OP
-}
-
-void GpuChannel::CacheShader(const std::string& key,
-                             const std::string& shader) {
-  gpu_channel_manager_->delegate()->StoreShaderToDisk(client_id_, key, shader);
-}
-
-void GpuChannel::AddFilter(IPC::MessageFilter* filter) {
-  io_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&GpuChannelMessageFilter::AddChannelFilter,
-                            filter_, make_scoped_refptr(filter)));
-}
-
-void GpuChannel::RemoveFilter(IPC::MessageFilter* filter) {
-  io_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&GpuChannelMessageFilter::RemoveChannelFilter,
-                            filter_, make_scoped_refptr(filter)));
-}
-
-uint64_t GpuChannel::GetMemoryUsage() {
-  // Collect the unique memory trackers in use by the |stubs_|.
-  std::set<gpu::gles2::MemoryTracker*> unique_memory_trackers;
-  for (auto& kv : stubs_)
-    unique_memory_trackers.insert(kv.second->GetMemoryTracker());
-
-  // Sum the memory usage for all unique memory trackers.
-  uint64_t size = 0;
-  for (auto* tracker : unique_memory_trackers) {
-    size += gpu_channel_manager()->gpu_memory_manager()->GetTrackerMemoryUsage(
-        tracker);
-  }
-
-  return size;
-}
-
-scoped_refptr<gl::GLImage> GpuChannel::CreateImageForGpuMemoryBuffer(
-    const gfx::GpuMemoryBufferHandle& handle,
-    const gfx::Size& size,
-    gfx::BufferFormat format,
-    uint32_t internalformat) {
-  switch (handle.type) {
-    case gfx::SHARED_MEMORY_BUFFER: {
-      if (!base::IsValueInRangeForNumericType<size_t>(handle.stride))
-        return nullptr;
-      scoped_refptr<gl::GLImageSharedMemory> image(
-          new gl::GLImageSharedMemory(size, internalformat));
-      if (!image->Initialize(handle.handle, handle.id, format, handle.offset,
-                             handle.stride)) {
-        return nullptr;
-      }
-
-      return image;
-    }
-    default: {
-      GpuChannelManager* manager = gpu_channel_manager();
-      if (!manager->gpu_memory_buffer_factory())
-        return nullptr;
-
-      return manager->gpu_memory_buffer_factory()
-          ->AsImageFactory()
-          ->CreateImageForGpuMemoryBuffer(handle,
-                                          size,
-                                          format,
-                                          internalformat,
-                                          client_id_);
-    }
-  }
-}
-
-void GpuChannel::HandleUpdateValueState(
-    unsigned int target, const gpu::ValueState& state) {
-  pending_valuebuffer_state_->UpdateState(target, state);
-}
-
-}  // namespace content