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

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ea4d94421296975355842dd5016541324907648a
--- /dev/null
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -0,0 +1,1143 @@
+// 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_command_buffer_stub.h"
+
+#include <utility>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/hash.h"
+#include "base/json/json_writer.h"
+#include "base/macros.h"
+#include "base/memory/shared_memory.h"
+#include "base/time/time.h"
+#include "base/trace_event/trace_event.h"
+#include "build/build_config.h"
+#include "content/common/gpu/gpu_channel.h"
+#include "content/common/gpu/gpu_channel_manager.h"
+#include "content/common/gpu/gpu_channel_manager_delegate.h"
+#include "content/common/gpu/gpu_memory_manager.h"
+#include "content/common/gpu/gpu_memory_tracking.h"
+#include "content/common/gpu/gpu_watchdog.h"
+#include "content/common/gpu/image_transport_surface.h"
+#include "gpu/command_buffer/common/constants.h"
+#include "gpu/command_buffer/common/mailbox.h"
+#include "gpu/command_buffer/common/sync_token.h"
+#include "gpu/command_buffer/service/gl_context_virtual.h"
+#include "gpu/command_buffer/service/gl_state_restorer_impl.h"
+#include "gpu/command_buffer/service/image_factory.h"
+#include "gpu/command_buffer/service/image_manager.h"
+#include "gpu/command_buffer/service/logger.h"
+#include "gpu/command_buffer/service/mailbox_manager.h"
+#include "gpu/command_buffer/service/memory_tracking.h"
+#include "gpu/command_buffer/service/query_manager.h"
+#include "gpu/command_buffer/service/sync_point_manager.h"
+#include "gpu/command_buffer/service/transfer_buffer_manager.h"
+#include "gpu/command_buffer/service/valuebuffer_manager.h"
+#include "gpu/ipc/common/gpu_messages.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_image.h"
+#include "ui/gl/gl_switches.h"
+
+#if defined(OS_WIN)
+#include "base/win/win_util.h"
+#endif
+
+#if defined(OS_ANDROID)
+#include "content/common/gpu/stream_texture_android.h"
+#endif
+
+namespace content {
+struct WaitForCommandState {
+  WaitForCommandState(int32_t start, int32_t end, IPC::Message* reply)
+      : start(start), end(end), reply(reply) {}
+
+  int32_t start;
+  int32_t end;
+  scoped_ptr<IPC::Message> reply;
+};
+
+namespace {
+
+// The GpuCommandBufferMemoryTracker class provides a bridge between the
+// ContextGroup's memory type managers and the GpuMemoryManager class.
+class GpuCommandBufferMemoryTracker : public gpu::gles2::MemoryTracker {
+ public:
+  explicit GpuCommandBufferMemoryTracker(GpuChannel* channel,
+                                         uint64_t share_group_tracing_guid)
+      : tracking_group_(
+            channel->gpu_channel_manager()
+                ->gpu_memory_manager()
+                ->CreateTrackingGroup(channel->GetClientPID(), this)),
+        client_tracing_id_(channel->client_tracing_id()),
+        client_id_(channel->client_id()),
+        share_group_tracing_guid_(share_group_tracing_guid) {}
+
+  void TrackMemoryAllocatedChange(
+      size_t old_size, size_t new_size) override {
+    tracking_group_->TrackMemoryAllocatedChange(
+        old_size, new_size);
+  }
+
+  bool EnsureGPUMemoryAvailable(size_t size_needed) override {
+    return tracking_group_->EnsureGPUMemoryAvailable(size_needed);
+  };
+
+  uint64_t ClientTracingId() const override { return client_tracing_id_; }
+  int ClientId() const override { return client_id_; }
+  uint64_t ShareGroupTracingGUID() const override {
+    return share_group_tracing_guid_;
+  }
+
+ private:
+  ~GpuCommandBufferMemoryTracker() override {}
+  scoped_ptr<GpuMemoryTrackingGroup> tracking_group_;
+  const uint64_t client_tracing_id_;
+  const int client_id_;
+  const uint64_t share_group_tracing_guid_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuCommandBufferMemoryTracker);
+};
+
+// FastSetActiveURL will shortcut the expensive call to SetActiveURL when the
+// url_hash matches.
+void FastSetActiveURL(const GURL& url, size_t url_hash, GpuChannel* channel) {
+  // Leave the previously set URL in the empty case -- empty URLs are given by
+  // BlinkPlatformImpl::createOffscreenGraphicsContext3DProvider. Hopefully the
+  // onscreen context URL was set previously and will show up even when a crash
+  // occurs during offscreen command processing.
+  if (url.is_empty())
+    return;
+  static size_t g_last_url_hash = 0;
+  if (url_hash != g_last_url_hash) {
+    g_last_url_hash = url_hash;
+    DCHECK(channel && channel->gpu_channel_manager() &&
+           channel->gpu_channel_manager()->delegate());
+    channel->gpu_channel_manager()->delegate()->SetActiveURL(url);
+  }
+}
+
+// The first time polling a fence, delay some extra time to allow other
+// stubs to process some work, or else the timing of the fences could
+// allow a pattern of alternating fast and slow frames to occur.
+const int64_t kHandleMoreWorkPeriodMs = 2;
+const int64_t kHandleMoreWorkPeriodBusyMs = 1;
+
+// Prevents idle work from being starved.
+const int64_t kMaxTimeSinceIdleMs = 10;
+
+class DevToolsChannelData : public base::trace_event::ConvertableToTraceFormat {
+ public:
+  static scoped_ptr<base::trace_event::ConvertableToTraceFormat>
+  CreateForChannel(GpuChannel* channel);
+  ~DevToolsChannelData() override {}
+
+  void AppendAsTraceFormat(std::string* out) const override {
+    std::string tmp;
+    base::JSONWriter::Write(*value_, &tmp);
+    *out += tmp;
+  }
+
+ private:
+  explicit DevToolsChannelData(base::Value* value) : value_(value) {}
+  scoped_ptr<base::Value> value_;
+  DISALLOW_COPY_AND_ASSIGN(DevToolsChannelData);
+};
+
+scoped_ptr<base::trace_event::ConvertableToTraceFormat>
+DevToolsChannelData::CreateForChannel(GpuChannel* channel) {
+  scoped_ptr<base::DictionaryValue> res(new base::DictionaryValue);
+  res->SetInteger("renderer_pid", channel->GetClientPID());
+  res->SetDouble("used_bytes", channel->GetMemoryUsage());
+  return make_scoped_ptr(new DevToolsChannelData(res.release()));
+}
+
+gpu::CommandBufferId GetCommandBufferID(int channel_id, int32_t route_id) {
+  return gpu::CommandBufferId::FromUnsafeValue(
+      (static_cast<uint64_t>(channel_id) << 32) | route_id);
+}
+
+}  // namespace
+
+GpuCommandBufferStub::GpuCommandBufferStub(
+    GpuChannel* channel,
+    gpu::SyncPointManager* sync_point_manager,
+    base::SingleThreadTaskRunner* task_runner,
+    GpuCommandBufferStub* share_group,
+    gpu::SurfaceHandle surface_handle,
+    gpu::gles2::MailboxManager* mailbox_manager,
+    gpu::PreemptionFlag* preempt_by_flag,
+    gpu::gles2::SubscriptionRefSet* subscription_ref_set,
+    gpu::ValueStateMap* pending_valuebuffer_state,
+    const gfx::Size& size,
+    const gpu::gles2::DisallowedFeatures& disallowed_features,
+    const std::vector<int32_t>& attribs,
+    gfx::GpuPreference gpu_preference,
+    int32_t stream_id,
+    int32_t route_id,
+    GpuWatchdog* watchdog,
+    const GURL& active_url)
+    : channel_(channel),
+      sync_point_manager_(sync_point_manager),
+      task_runner_(task_runner),
+      initialized_(false),
+      surface_handle_(surface_handle),
+      initial_size_(size),
+      disallowed_features_(disallowed_features),
+      requested_attribs_(attribs),
+      gpu_preference_(gpu_preference),
+      use_virtualized_gl_context_(false),
+      command_buffer_id_(GetCommandBufferID(channel->client_id(), route_id)),
+      stream_id_(stream_id),
+      route_id_(route_id),
+      last_flush_count_(0),
+      surface_format_(gfx::GLSurface::SURFACE_DEFAULT),
+      watchdog_(watchdog),
+      waiting_for_sync_point_(false),
+      previous_processed_num_(0),
+      preemption_flag_(preempt_by_flag),
+      active_url_(active_url) {
+  active_url_hash_ = base::Hash(active_url.possibly_invalid_spec());
+  FastSetActiveURL(active_url_, active_url_hash_, channel_);
+
+  gpu::gles2::ContextCreationAttribHelper attrib_parser;
+  attrib_parser.Parse(requested_attribs_);
+
+  if (share_group) {
+    context_group_ = share_group->context_group_;
+    DCHECK(context_group_->bind_generates_resource() ==
+           attrib_parser.bind_generates_resource);
+  } else {
+    context_group_ = new gpu::gles2::ContextGroup(
+        channel_->gpu_channel_manager()->gpu_preferences(), mailbox_manager,
+        new GpuCommandBufferMemoryTracker(channel,
+                                          command_buffer_id_.GetUnsafeValue()),
+        channel_->gpu_channel_manager()->shader_translator_cache(),
+        channel_->gpu_channel_manager()->framebuffer_completeness_cache(), NULL,
+        subscription_ref_set, pending_valuebuffer_state,
+        attrib_parser.bind_generates_resource);
+  }
+
+// Virtualize PreferIntegratedGpu contexts by default on OS X to prevent
+// performance regressions when enabling FCM.
+// http://crbug.com/180463
+#if defined(OS_MACOSX)
+  if (gpu_preference_ == gfx::PreferIntegratedGpu)
+    use_virtualized_gl_context_ = true;
+#endif
+
+  use_virtualized_gl_context_ |=
+      context_group_->feature_info()->workarounds().use_virtualized_gl_contexts;
+
+  // MailboxManagerSync synchronization correctness currently depends on having
+  // only a single context. See crbug.com/510243 for details.
+  use_virtualized_gl_context_ |= mailbox_manager->UsesSync();
+
+#if defined(OS_ANDROID)
+  if (attrib_parser.red_size <= 5 &&
+      attrib_parser.green_size <= 6 &&
+      attrib_parser.blue_size <= 5 &&
+      attrib_parser.alpha_size == 0)
+    surface_format_ = gfx::GLSurface::SURFACE_RGB565;
+  gfx::GLSurface* defaultOffscreenSurface =
+      channel_->gpu_channel_manager()->GetDefaultOffscreenSurface();
+  bool is_onscreen = (surface_handle_ != gpu::kNullSurfaceHandle);
+  if (surface_format_ != defaultOffscreenSurface->GetFormat() && is_onscreen)
+    use_virtualized_gl_context_ = false;
+#endif
+
+  if ((surface_handle_ == gpu::kNullSurfaceHandle) && initial_size_.IsEmpty()) {
+    // If we're an offscreen surface with zero width and/or height, set to a
+    // non-zero size so that we have a complete framebuffer for operations like
+    // glClear.
+    initial_size_ = gfx::Size(1, 1);
+  }
+}
+
+GpuCommandBufferStub::~GpuCommandBufferStub() {
+  Destroy();
+}
+
+GpuMemoryManager* GpuCommandBufferStub::GetMemoryManager() const {
+    return channel()->gpu_channel_manager()->gpu_memory_manager();
+}
+
+bool GpuCommandBufferStub::OnMessageReceived(const IPC::Message& message) {
+  TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"),
+               "GPUTask",
+               "data",
+               DevToolsChannelData::CreateForChannel(channel()));
+  FastSetActiveURL(active_url_, active_url_hash_, channel_);
+
+  bool have_context = false;
+  // Ensure the appropriate GL context is current before handling any IPC
+  // messages directed at the command buffer. This ensures that the message
+  // handler can assume that the context is current (not necessary for
+  // RetireSyncPoint or WaitSyncPoint).
+  if (decoder_.get() &&
+      message.type() != GpuCommandBufferMsg_SetGetBuffer::ID &&
+      message.type() != GpuCommandBufferMsg_WaitForTokenInRange::ID &&
+      message.type() != GpuCommandBufferMsg_WaitForGetOffsetInRange::ID &&
+      message.type() != GpuCommandBufferMsg_RegisterTransferBuffer::ID &&
+      message.type() != GpuCommandBufferMsg_DestroyTransferBuffer::ID) {
+    if (!MakeCurrent())
+      return false;
+    have_context = true;
+  }
+
+  // Always use IPC_MESSAGE_HANDLER_DELAY_REPLY for synchronous message handlers
+  // here. This is so the reply can be delayed if the scheduler is unscheduled.
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(GpuCommandBufferStub, message)
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_Initialize,
+                                    OnInitialize);
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_SetGetBuffer,
+                                    OnSetGetBuffer);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_ProduceFrontBuffer,
+                        OnProduceFrontBuffer);
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_WaitForTokenInRange,
+                                    OnWaitForTokenInRange);
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_WaitForGetOffsetInRange,
+                                    OnWaitForGetOffsetInRange);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_AsyncFlush, OnAsyncFlush);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_RegisterTransferBuffer,
+                        OnRegisterTransferBuffer);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_DestroyTransferBuffer,
+                        OnDestroyTransferBuffer);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SignalSyncToken,
+                        OnSignalSyncToken)
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SignalQuery,
+                        OnSignalQuery)
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_CreateImage, OnCreateImage);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_DestroyImage, OnDestroyImage);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_CreateStreamTexture,
+                        OnCreateStreamTexture)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  CheckCompleteWaits();
+
+  // Ensure that any delayed work that was created will be handled.
+  if (have_context) {
+    if (executor_)
+      executor_->ProcessPendingQueries();
+    ScheduleDelayedWork(
+        base::TimeDelta::FromMilliseconds(kHandleMoreWorkPeriodMs));
+  }
+
+  return handled;
+}
+
+bool GpuCommandBufferStub::Send(IPC::Message* message) {
+  return channel_->Send(message);
+}
+
+bool GpuCommandBufferStub::IsScheduled() {
+  return (!executor_.get() || executor_->scheduled());
+}
+
+void GpuCommandBufferStub::PollWork() {
+  // Post another delayed task if we have not yet reached the time at which
+  // we should process delayed work.
+  base::TimeTicks current_time = base::TimeTicks::Now();
+  DCHECK(!process_delayed_work_time_.is_null());
+  if (process_delayed_work_time_ > current_time) {
+    task_runner_->PostDelayedTask(
+        FROM_HERE, base::Bind(&GpuCommandBufferStub::PollWork, AsWeakPtr()),
+        process_delayed_work_time_ - current_time);
+    return;
+  }
+  process_delayed_work_time_ = base::TimeTicks();
+
+  PerformWork();
+}
+
+void GpuCommandBufferStub::PerformWork() {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::PerformWork");
+
+  FastSetActiveURL(active_url_, active_url_hash_, channel_);
+  if (decoder_.get() && !MakeCurrent())
+    return;
+
+  if (executor_) {
+    uint32_t current_unprocessed_num =
+        channel()->gpu_channel_manager()->GetUnprocessedOrderNum();
+    // We're idle when no messages were processed or scheduled.
+    bool is_idle = (previous_processed_num_ == current_unprocessed_num);
+    if (!is_idle && !last_idle_time_.is_null()) {
+      base::TimeDelta time_since_idle =
+          base::TimeTicks::Now() - last_idle_time_;
+      base::TimeDelta max_time_since_idle =
+          base::TimeDelta::FromMilliseconds(kMaxTimeSinceIdleMs);
+
+      // Force idle when it's been too long since last time we were idle.
+      if (time_since_idle > max_time_since_idle)
+        is_idle = true;
+    }
+
+    if (is_idle) {
+      last_idle_time_ = base::TimeTicks::Now();
+      executor_->PerformIdleWork();
+    }
+
+    executor_->ProcessPendingQueries();
+  }
+
+  ScheduleDelayedWork(
+      base::TimeDelta::FromMilliseconds(kHandleMoreWorkPeriodBusyMs));
+}
+
+bool GpuCommandBufferStub::HasUnprocessedCommands() {
+  if (command_buffer_) {
+    gpu::CommandBuffer::State state = command_buffer_->GetLastState();
+    return command_buffer_->GetPutOffset() != state.get_offset &&
+        !gpu::error::IsError(state.error);
+  }
+  return false;
+}
+
+void GpuCommandBufferStub::ScheduleDelayedWork(base::TimeDelta delay) {
+  bool has_more_work = executor_.get() && (executor_->HasPendingQueries() ||
+                                           executor_->HasMoreIdleWork());
+  if (!has_more_work) {
+    last_idle_time_ = base::TimeTicks();
+    return;
+  }
+
+  base::TimeTicks current_time = base::TimeTicks::Now();
+  // |process_delayed_work_time_| is set if processing of delayed work is
+  // already scheduled. Just update the time if already scheduled.
+  if (!process_delayed_work_time_.is_null()) {
+    process_delayed_work_time_ = current_time + delay;
+    return;
+  }
+
+  // Idle when no messages are processed between now and when
+  // PollWork is called.
+  previous_processed_num_ =
+      channel()->gpu_channel_manager()->GetProcessedOrderNum();
+  if (last_idle_time_.is_null())
+    last_idle_time_ = current_time;
+
+  // IsScheduled() returns true after passing all unschedule fences
+  // and this is when we can start performing idle work. Idle work
+  // is done synchronously so we can set delay to 0 and instead poll
+  // for more work at the rate idle work is performed. This also ensures
+  // that idle work is done as efficiently as possible without any
+  // unnecessary delays.
+  if (executor_.get() && executor_->scheduled() &&
+      executor_->HasMoreIdleWork()) {
+    delay = base::TimeDelta();
+  }
+
+  process_delayed_work_time_ = current_time + delay;
+  task_runner_->PostDelayedTask(
+      FROM_HERE, base::Bind(&GpuCommandBufferStub::PollWork, AsWeakPtr()),
+      delay);
+}
+
+bool GpuCommandBufferStub::MakeCurrent() {
+  if (decoder_->MakeCurrent())
+    return true;
+  DLOG(ERROR) << "Context lost because MakeCurrent failed.";
+  command_buffer_->SetContextLostReason(decoder_->GetContextLostReason());
+  command_buffer_->SetParseError(gpu::error::kLostContext);
+  CheckContextLost();
+  return false;
+}
+
+void GpuCommandBufferStub::Destroy() {
+  if (wait_for_token_) {
+    Send(wait_for_token_->reply.release());
+    wait_for_token_.reset();
+  }
+  if (wait_for_get_offset_) {
+    Send(wait_for_get_offset_->reply.release());
+    wait_for_get_offset_.reset();
+  }
+
+  if (initialized_) {
+    GpuChannelManager* gpu_channel_manager = channel_->gpu_channel_manager();
+    if ((surface_handle_ == gpu::kNullSurfaceHandle) && !active_url_.is_empty())
+      gpu_channel_manager->delegate()->DidDestroyOffscreenContext(active_url_);
+  }
+
+  if (decoder_)
+    decoder_->set_engine(NULL);
+
+  // The scheduler has raw references to the decoder and the command buffer so
+  // destroy it before those.
+  executor_.reset();
+
+  sync_point_client_.reset();
+
+  bool have_context = false;
+  if (decoder_ && decoder_->GetGLContext()) {
+    // Try to make the context current regardless of whether it was lost, so we
+    // don't leak resources.
+    have_context = decoder_->GetGLContext()->MakeCurrent(surface_.get());
+  }
+  FOR_EACH_OBSERVER(DestructionObserver,
+                    destruction_observers_,
+                    OnWillDestroyStub());
+
+  if (decoder_) {
+    decoder_->Destroy(have_context);
+    decoder_.reset();
+  }
+
+  command_buffer_.reset();
+
+  // Remove this after crbug.com/248395 is sorted out.
+  surface_ = NULL;
+}
+
+void GpuCommandBufferStub::OnInitializeFailed(IPC::Message* reply_message) {
+  Destroy();
+  GpuCommandBufferMsg_Initialize::WriteReplyParams(
+      reply_message, false, gpu::Capabilities());
+  Send(reply_message);
+}
+
+scoped_refptr<gfx::GLSurface> GpuCommandBufferStub::CreateSurface() {
+  GpuChannelManager* manager = channel_->gpu_channel_manager();
+  scoped_refptr<gfx::GLSurface> surface;
+  if (surface_handle_ != gpu::kNullSurfaceHandle) {
+    surface = ImageTransportSurface::CreateNativeSurface(
+        manager, this, surface_handle_, surface_format_);
+    if (!surface || !surface->Initialize(surface_format_))
+      return nullptr;
+  } else {
+    surface = manager->GetDefaultOffscreenSurface();
+  }
+  return surface;
+}
+
+void GpuCommandBufferStub::OnInitialize(
+    base::SharedMemoryHandle shared_state_handle,
+    IPC::Message* reply_message) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnInitialize");
+  DCHECK(!command_buffer_.get());
+
+  scoped_ptr<base::SharedMemory> shared_state_shm(
+      new base::SharedMemory(shared_state_handle, false));
+
+  command_buffer_.reset(new gpu::CommandBufferService(
+      context_group_->transfer_buffer_manager()));
+
+  bool result = command_buffer_->Initialize();
+  DCHECK(result);
+
+  GpuChannelManager* manager = channel_->gpu_channel_manager();
+  DCHECK(manager);
+
+  decoder_.reset(::gpu::gles2::GLES2Decoder::Create(context_group_.get()));
+  executor_.reset(new gpu::CommandExecutor(command_buffer_.get(),
+                                           decoder_.get(), decoder_.get()));
+  sync_point_client_ = sync_point_manager_->CreateSyncPointClient(
+      channel_->GetSyncPointOrderData(stream_id_),
+      gpu::CommandBufferNamespace::GPU_IO, command_buffer_id_);
+
+  if (preemption_flag_.get())
+    executor_->SetPreemptByFlag(preemption_flag_);
+
+  decoder_->set_engine(executor_.get());
+
+  surface_ = CreateSurface();
+  if (!surface_.get()) {
+    DLOG(ERROR) << "Failed to create surface.";
+    OnInitializeFailed(reply_message);
+    return;
+  }
+
+  scoped_refptr<gfx::GLContext> context;
+  gfx::GLShareGroup* share_group = channel_->share_group();
+  if (use_virtualized_gl_context_ && share_group) {
+    context = share_group->GetSharedContext();
+    if (!context.get()) {
+      context = gfx::GLContext::CreateGLContext(
+          channel_->share_group(),
+          channel_->gpu_channel_manager()->GetDefaultOffscreenSurface(),
+          gpu_preference_);
+      if (!context.get()) {
+        DLOG(ERROR) << "Failed to create shared context for virtualization.";
+        OnInitializeFailed(reply_message);
+        return;
+      }
+      channel_->share_group()->SetSharedContext(context.get());
+    }
+    // This should be a non-virtual GL context.
+    DCHECK(context->GetHandle());
+    context = new gpu::GLContextVirtual(
+        share_group, context.get(), decoder_->AsWeakPtr());
+    if (!context->Initialize(surface_.get(), gpu_preference_)) {
+      // The real context created above for the default offscreen surface
+      // might not be compatible with this surface.
+      context = NULL;
+
+      DLOG(ERROR) << "Failed to initialize virtual GL context.";
+      OnInitializeFailed(reply_message);
+      return;
+    }
+  }
+  if (!context.get()) {
+    context = gfx::GLContext::CreateGLContext(
+        share_group, surface_.get(), gpu_preference_);
+  }
+  if (!context.get()) {
+    DLOG(ERROR) << "Failed to create context.";
+    OnInitializeFailed(reply_message);
+    return;
+  }
+
+  if (!context->MakeCurrent(surface_.get())) {
+    LOG(ERROR) << "Failed to make context current.";
+    OnInitializeFailed(reply_message);
+    return;
+  }
+
+  if (!context->GetGLStateRestorer()) {
+    context->SetGLStateRestorer(
+        new gpu::GLStateRestorerImpl(decoder_->AsWeakPtr()));
+  }
+
+  if (!context_group_->has_program_cache() &&
+      !context_group_->feature_info()->workarounds().disable_program_cache) {
+    context_group_->set_program_cache(
+        channel_->gpu_channel_manager()->program_cache());
+  }
+
+  // Initialize the decoder with either the view or pbuffer GLContext.
+  bool offscreen = (surface_handle_ == gpu::kNullSurfaceHandle);
+  if (!decoder_->Initialize(surface_, context, offscreen, initial_size_,
+                            disallowed_features_, requested_attribs_)) {
+    DLOG(ERROR) << "Failed to initialize decoder.";
+    OnInitializeFailed(reply_message);
+    return;
+  }
+
+  if (channel_->gpu_channel_manager()->
+      gpu_preferences().enable_gpu_service_logging) {
+    decoder_->set_log_commands(true);
+  }
+
+  decoder_->GetLogger()->SetMsgCallback(
+      base::Bind(&GpuCommandBufferStub::SendConsoleMessage,
+                 base::Unretained(this)));
+  decoder_->SetShaderCacheCallback(
+      base::Bind(&GpuCommandBufferStub::SendCachedShader,
+                 base::Unretained(this)));
+  decoder_->SetFenceSyncReleaseCallback(base::Bind(
+      &GpuCommandBufferStub::OnFenceSyncRelease, base::Unretained(this)));
+  decoder_->SetWaitFenceSyncCallback(base::Bind(
+      &GpuCommandBufferStub::OnWaitFenceSync, base::Unretained(this)));
+
+  command_buffer_->SetPutOffsetChangeCallback(
+      base::Bind(&GpuCommandBufferStub::PutChanged, base::Unretained(this)));
+  command_buffer_->SetGetBufferChangeCallback(base::Bind(
+      &gpu::CommandExecutor::SetGetBuffer, base::Unretained(executor_.get())));
+  command_buffer_->SetParseErrorCallback(
+      base::Bind(&GpuCommandBufferStub::OnParseError, base::Unretained(this)));
+  executor_->SetSchedulingChangedCallback(base::Bind(
+      &GpuCommandBufferStub::OnSchedulingChanged, base::Unretained(this)));
+
+  if (watchdog_) {
+    executor_->SetCommandProcessedCallback(base::Bind(
+        &GpuCommandBufferStub::OnCommandProcessed, base::Unretained(this)));
+  }
+
+  const size_t kSharedStateSize = sizeof(gpu::CommandBufferSharedState);
+  if (!shared_state_shm->Map(kSharedStateSize)) {
+    DLOG(ERROR) << "Failed to map shared state buffer.";
+    OnInitializeFailed(reply_message);
+    return;
+  }
+  command_buffer_->SetSharedStateBuffer(gpu::MakeBackingFromSharedMemory(
+      std::move(shared_state_shm), kSharedStateSize));
+
+  gpu::Capabilities capabilities = decoder_->GetCapabilities();
+
+  GpuCommandBufferMsg_Initialize::WriteReplyParams(
+      reply_message, true, capabilities);
+  Send(reply_message);
+
+  if ((surface_handle_ == gpu::kNullSurfaceHandle) && !active_url_.is_empty())
+    manager->delegate()->DidCreateOffscreenContext(active_url_);
+
+  initialized_ = true;
+}
+
+void GpuCommandBufferStub::OnCreateStreamTexture(uint32_t texture_id,
+                                                 int32_t stream_id,
+                                                 bool* succeeded) {
+#if defined(OS_ANDROID)
+  *succeeded = StreamTexture::Create(this, texture_id, stream_id);
+#else
+  *succeeded = false;
+#endif
+}
+
+void GpuCommandBufferStub::SetLatencyInfoCallback(
+    const LatencyInfoCallback& callback) {
+  latency_info_callback_ = callback;
+}
+
+int32_t GpuCommandBufferStub::GetRequestedAttribute(int attr) const {
+  // The command buffer is pairs of enum, value
+  // search for the requested attribute, return the value.
+  for (std::vector<int32_t>::const_iterator it = requested_attribs_.begin();
+       it != requested_attribs_.end(); ++it) {
+    if (*it++ == attr) {
+      return *it;
+    }
+  }
+  return -1;
+}
+
+void GpuCommandBufferStub::OnSetGetBuffer(int32_t shm_id,
+                                          IPC::Message* reply_message) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnSetGetBuffer");
+  if (command_buffer_)
+    command_buffer_->SetGetBuffer(shm_id);
+  Send(reply_message);
+}
+
+void GpuCommandBufferStub::OnProduceFrontBuffer(const gpu::Mailbox& mailbox) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnProduceFrontBuffer");
+  if (!decoder_) {
+    LOG(ERROR) << "Can't produce front buffer before initialization.";
+    return;
+  }
+
+  decoder_->ProduceFrontBuffer(mailbox);
+}
+
+void GpuCommandBufferStub::OnParseError() {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnParseError");
+  DCHECK(command_buffer_.get());
+  gpu::CommandBuffer::State state = command_buffer_->GetLastState();
+  IPC::Message* msg = new GpuCommandBufferMsg_Destroyed(
+      route_id_, state.context_lost_reason, state.error);
+  msg->set_unblock(true);
+  Send(msg);
+
+  // Tell the browser about this context loss as well, so it can
+  // determine whether client APIs like WebGL need to be immediately
+  // blocked from automatically running.
+  GpuChannelManager* gpu_channel_manager = channel_->gpu_channel_manager();
+  gpu_channel_manager->delegate()->DidLoseContext(
+      (surface_handle_ == gpu::kNullSurfaceHandle), state.context_lost_reason,
+      active_url_);
+
+  CheckContextLost();
+}
+
+void GpuCommandBufferStub::OnSchedulingChanged(bool scheduled) {
+  TRACE_EVENT1("gpu", "GpuCommandBufferStub::OnSchedulingChanged", "scheduled",
+               scheduled);
+  channel_->OnStreamRescheduled(stream_id_, scheduled);
+}
+
+void GpuCommandBufferStub::OnWaitForTokenInRange(int32_t start,
+                                                 int32_t end,
+                                                 IPC::Message* reply_message) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnWaitForTokenInRange");
+  DCHECK(command_buffer_.get());
+  CheckContextLost();
+  if (wait_for_token_)
+    LOG(ERROR) << "Got WaitForToken command while currently waiting for token.";
+  wait_for_token_ =
+      make_scoped_ptr(new WaitForCommandState(start, end, reply_message));
+  CheckCompleteWaits();
+}
+
+void GpuCommandBufferStub::OnWaitForGetOffsetInRange(
+    int32_t start,
+    int32_t end,
+    IPC::Message* reply_message) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnWaitForGetOffsetInRange");
+  DCHECK(command_buffer_.get());
+  CheckContextLost();
+  if (wait_for_get_offset_) {
+    LOG(ERROR)
+        << "Got WaitForGetOffset command while currently waiting for offset.";
+  }
+  wait_for_get_offset_ =
+      make_scoped_ptr(new WaitForCommandState(start, end, reply_message));
+  CheckCompleteWaits();
+}
+
+void GpuCommandBufferStub::CheckCompleteWaits() {
+  if (wait_for_token_ || wait_for_get_offset_) {
+    gpu::CommandBuffer::State state = command_buffer_->GetLastState();
+    if (wait_for_token_ &&
+        (gpu::CommandBuffer::InRange(
+             wait_for_token_->start, wait_for_token_->end, state.token) ||
+         state.error != gpu::error::kNoError)) {
+      ReportState();
+      GpuCommandBufferMsg_WaitForTokenInRange::WriteReplyParams(
+          wait_for_token_->reply.get(), state);
+      Send(wait_for_token_->reply.release());
+      wait_for_token_.reset();
+    }
+    if (wait_for_get_offset_ &&
+        (gpu::CommandBuffer::InRange(wait_for_get_offset_->start,
+                                     wait_for_get_offset_->end,
+                                     state.get_offset) ||
+         state.error != gpu::error::kNoError)) {
+      ReportState();
+      GpuCommandBufferMsg_WaitForGetOffsetInRange::WriteReplyParams(
+          wait_for_get_offset_->reply.get(), state);
+      Send(wait_for_get_offset_->reply.release());
+      wait_for_get_offset_.reset();
+    }
+  }
+}
+
+void GpuCommandBufferStub::OnAsyncFlush(
+    int32_t put_offset,
+    uint32_t flush_count,
+    const std::vector<ui::LatencyInfo>& latency_info) {
+  TRACE_EVENT1(
+      "gpu", "GpuCommandBufferStub::OnAsyncFlush", "put_offset", put_offset);
+  DCHECK(command_buffer_);
+
+  // We received this message out-of-order. This should not happen but is here
+  // to catch regressions. Ignore the message.
+  DVLOG_IF(0, flush_count - last_flush_count_ >= 0x8000000U)
+      << "Received a Flush message out-of-order";
+
+  if (flush_count > last_flush_count_ &&
+      ui::LatencyInfo::Verify(latency_info,
+                              "GpuCommandBufferStub::OnAsyncFlush") &&
+      !latency_info_callback_.is_null()) {
+    latency_info_callback_.Run(latency_info);
+  }
+
+  last_flush_count_ = flush_count;
+  gpu::CommandBuffer::State pre_state = command_buffer_->GetLastState();
+  command_buffer_->Flush(put_offset);
+  gpu::CommandBuffer::State post_state = command_buffer_->GetLastState();
+
+  if (pre_state.get_offset != post_state.get_offset)
+    ReportState();
+
+#if defined(OS_ANDROID)
+  GpuChannelManager* manager = channel_->gpu_channel_manager();
+  manager->DidAccessGpu();
+#endif
+}
+
+void GpuCommandBufferStub::OnRegisterTransferBuffer(
+    int32_t id,
+    base::SharedMemoryHandle transfer_buffer,
+    uint32_t size) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnRegisterTransferBuffer");
+
+  // Take ownership of the memory and map it into this process.
+  // This validates the size.
+  scoped_ptr<base::SharedMemory> shared_memory(
+      new base::SharedMemory(transfer_buffer, false));
+  if (!shared_memory->Map(size)) {
+    DVLOG(0) << "Failed to map shared memory.";
+    return;
+  }
+
+  if (command_buffer_) {
+    command_buffer_->RegisterTransferBuffer(
+        id, gpu::MakeBackingFromSharedMemory(std::move(shared_memory), size));
+  }
+}
+
+void GpuCommandBufferStub::OnDestroyTransferBuffer(int32_t id) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnDestroyTransferBuffer");
+
+  if (command_buffer_)
+    command_buffer_->DestroyTransferBuffer(id);
+}
+
+void GpuCommandBufferStub::OnCommandProcessed() {
+  if (watchdog_)
+    watchdog_->CheckArmed();
+}
+
+void GpuCommandBufferStub::ReportState() { command_buffer_->UpdateState(); }
+
+void GpuCommandBufferStub::PutChanged() {
+  FastSetActiveURL(active_url_, active_url_hash_, channel_);
+  executor_->PutChanged();
+}
+
+void GpuCommandBufferStub::PullTextureUpdates(
+    gpu::CommandBufferNamespace namespace_id,
+    gpu::CommandBufferId command_buffer_id,
+    uint32_t release) {
+  gpu::gles2::MailboxManager* mailbox_manager =
+      context_group_->mailbox_manager();
+  if (mailbox_manager->UsesSync() && MakeCurrent()) {
+    gpu::SyncToken sync_token(namespace_id, 0, command_buffer_id, release);
+    mailbox_manager->PullTextureUpdates(sync_token);
+  }
+}
+
+void GpuCommandBufferStub::OnSignalSyncToken(const gpu::SyncToken& sync_token,
+                                             uint32_t id) {
+  scoped_refptr<gpu::SyncPointClientState> release_state =
+      sync_point_manager_->GetSyncPointClientState(
+          sync_token.namespace_id(), sync_token.command_buffer_id());
+
+  if (release_state) {
+    sync_point_client_->Wait(release_state.get(), sync_token.release_count(),
+                             base::Bind(&GpuCommandBufferStub::OnSignalAck,
+                                        this->AsWeakPtr(), id));
+  } else {
+    OnSignalAck(id);
+  }
+}
+
+void GpuCommandBufferStub::OnSignalAck(uint32_t id) {
+  Send(new GpuCommandBufferMsg_SignalAck(route_id_, id));
+}
+
+void GpuCommandBufferStub::OnSignalQuery(uint32_t query_id, uint32_t id) {
+  if (decoder_) {
+    gpu::gles2::QueryManager* query_manager = decoder_->GetQueryManager();
+    if (query_manager) {
+      gpu::gles2::QueryManager::Query* query =
+          query_manager->GetQuery(query_id);
+      if (query) {
+        query->AddCallback(
+          base::Bind(&GpuCommandBufferStub::OnSignalAck,
+                     this->AsWeakPtr(),
+                     id));
+        return;
+      }
+    }
+  }
+  // Something went wrong, run callback immediately.
+  OnSignalAck(id);
+}
+
+void GpuCommandBufferStub::OnFenceSyncRelease(uint64_t release) {
+  if (sync_point_client_->client_state()->IsFenceSyncReleased(release)) {
+    DLOG(ERROR) << "Fence Sync has already been released.";
+    return;
+  }
+
+  gpu::gles2::MailboxManager* mailbox_manager =
+      context_group_->mailbox_manager();
+  if (mailbox_manager->UsesSync() && MakeCurrent()) {
+    gpu::SyncToken sync_token(gpu::CommandBufferNamespace::GPU_IO, 0,
+                              command_buffer_id_, release);
+    mailbox_manager->PushTextureUpdates(sync_token);
+  }
+
+  sync_point_client_->ReleaseFenceSync(release);
+}
+
+bool GpuCommandBufferStub::OnWaitFenceSync(
+    gpu::CommandBufferNamespace namespace_id,
+    gpu::CommandBufferId command_buffer_id,
+    uint64_t release) {
+  DCHECK(!waiting_for_sync_point_);
+  DCHECK(executor_->scheduled());
+
+  scoped_refptr<gpu::SyncPointClientState> release_state =
+      sync_point_manager_->GetSyncPointClientState(namespace_id,
+                                                   command_buffer_id);
+
+  if (!release_state)
+    return true;
+
+  if (release_state->IsFenceSyncReleased(release)) {
+    PullTextureUpdates(namespace_id, command_buffer_id, release);
+    return true;
+  }
+
+  TRACE_EVENT_ASYNC_BEGIN1("gpu", "WaitFenceSync", this, "GpuCommandBufferStub",
+                           this);
+  waiting_for_sync_point_ = true;
+  sync_point_client_->WaitNonThreadSafe(
+      release_state.get(), release, task_runner_,
+      base::Bind(&GpuCommandBufferStub::OnWaitFenceSyncCompleted,
+                 this->AsWeakPtr(), namespace_id, command_buffer_id, release));
+
+  if (!waiting_for_sync_point_)
+    return true;
+
+  executor_->SetScheduled(false);
+  return false;
+}
+
+void GpuCommandBufferStub::OnWaitFenceSyncCompleted(
+    gpu::CommandBufferNamespace namespace_id,
+    gpu::CommandBufferId command_buffer_id,
+    uint64_t release) {
+  DCHECK(waiting_for_sync_point_);
+  TRACE_EVENT_ASYNC_END1("gpu", "WaitFenceSync", this, "GpuCommandBufferStub",
+                         this);
+  PullTextureUpdates(namespace_id, command_buffer_id, release);
+  waiting_for_sync_point_ = false;
+  executor_->SetScheduled(true);
+}
+
+void GpuCommandBufferStub::OnCreateImage(
+    const GpuCommandBufferMsg_CreateImage_Params& params) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnCreateImage");
+  const int32_t id = params.id;
+  const gfx::GpuMemoryBufferHandle& handle = params.gpu_memory_buffer;
+  const gfx::Size& size = params.size;
+  const gfx::BufferFormat& format = params.format;
+  const uint32_t internalformat = params.internal_format;
+  const uint64_t image_release_count = params.image_release_count;
+
+  if (!decoder_)
+    return;
+
+  gpu::gles2::ImageManager* image_manager = decoder_->GetImageManager();
+  DCHECK(image_manager);
+  if (image_manager->LookupImage(id)) {
+    LOG(ERROR) << "Image already exists with same ID.";
+    return;
+  }
+
+  if (!gpu::ImageFactory::IsGpuMemoryBufferFormatSupported(
+          format, decoder_->GetCapabilities())) {
+    LOG(ERROR) << "Format is not supported.";
+    return;
+  }
+
+  if (!gpu::ImageFactory::IsImageSizeValidForGpuMemoryBufferFormat(size,
+                                                                   format)) {
+    LOG(ERROR) << "Invalid image size for format.";
+    return;
+  }
+
+  if (!gpu::ImageFactory::IsImageFormatCompatibleWithGpuMemoryBufferFormat(
+          internalformat, format)) {
+    LOG(ERROR) << "Incompatible image format.";
+    return;
+  }
+
+  scoped_refptr<gl::GLImage> image = channel()->CreateImageForGpuMemoryBuffer(
+      handle, size, format, internalformat);
+  if (!image.get())
+    return;
+
+  image_manager->AddImage(image.get(), id);
+  if (image_release_count) {
+    sync_point_client_->ReleaseFenceSync(image_release_count);
+  }
+}
+
+void GpuCommandBufferStub::OnDestroyImage(int32_t id) {
+  TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnDestroyImage");
+
+  if (!decoder_)
+    return;
+
+  gpu::gles2::ImageManager* image_manager = decoder_->GetImageManager();
+  DCHECK(image_manager);
+  if (!image_manager->LookupImage(id)) {
+    LOG(ERROR) << "Image with ID doesn't exist.";
+    return;
+  }
+
+  image_manager->RemoveImage(id);
+}
+
+void GpuCommandBufferStub::SendConsoleMessage(int32_t id,
+                                              const std::string& message) {
+  GPUCommandBufferConsoleMessage console_message;
+  console_message.id = id;
+  console_message.message = message;
+  IPC::Message* msg = new GpuCommandBufferMsg_ConsoleMsg(
+      route_id_, console_message);
+  msg->set_unblock(true);
+  Send(msg);
+}
+
+void GpuCommandBufferStub::SendCachedShader(
+    const std::string& key, const std::string& shader) {
+  channel_->CacheShader(key, shader);
+}
+
+void GpuCommandBufferStub::AddDestructionObserver(
+    DestructionObserver* observer) {
+  destruction_observers_.AddObserver(observer);
+}
+
+void GpuCommandBufferStub::RemoveDestructionObserver(
+    DestructionObserver* observer) {
+  destruction_observers_.RemoveObserver(observer);
+}
+
+const gpu::gles2::FeatureInfo* GpuCommandBufferStub::GetFeatureInfo() const {
+  return context_group_->feature_info();
+}
+
+gpu::gles2::MemoryTracker* GpuCommandBufferStub::GetMemoryTracker() const {
+  return context_group_->memory_tracker();
+}
+
+bool GpuCommandBufferStub::CheckContextLost() {
+  DCHECK(command_buffer_);
+  gpu::CommandBuffer::State state = command_buffer_->GetLastState();
+  bool was_lost = state.error == gpu::error::kLostContext;
+
+  if (was_lost) {
+    bool was_lost_by_robustness =
+        decoder_ && decoder_->WasContextLostByRobustnessExtension();
+
+    // Work around issues with recovery by allowing a new GPU process to launch.
+    if ((was_lost_by_robustness ||
+         context_group_->feature_info()->workarounds().exit_on_context_lost) &&
+        !channel_->gpu_channel_manager()->gpu_preferences().single_process &&
+        !channel_->gpu_channel_manager()->gpu_preferences().in_process_gpu) {
+      LOG(ERROR) << "Exiting GPU process because some drivers cannot recover"
+                 << " from problems.";
+      // Signal the message loop to quit to shut down other threads
+      // gracefully.
+      base::MessageLoop::current()->QuitNow();
+    }
+
+    // Lose all other contexts if the reset was triggered by the robustness
+    // extension instead of being synthetic.
+    if (was_lost_by_robustness &&
+        (gfx::GLContext::LosesAllContextsOnContextLost() ||
+         use_virtualized_gl_context_)) {
+      channel_->LoseAllContexts();
+    }
+  }
+
+  CheckCompleteWaits();
+  return was_lost;
+}
+
+void GpuCommandBufferStub::MarkContextLost() {
+  if (!command_buffer_ ||
+      command_buffer_->GetLastState().error == gpu::error::kLostContext)
+    return;
+
+  command_buffer_->SetContextLostReason(gpu::error::kUnknown);
+  if (decoder_)
+    decoder_->MarkContextLost(gpu::error::kUnknown);
+  command_buffer_->SetParseError(gpu::error::kLostContext);
+}
+
+void GpuCommandBufferStub::SendSwapBuffersCompleted(
+    const std::vector<ui::LatencyInfo>& latency_info,
+    gfx::SwapResult result) {
+  Send(new GpuCommandBufferMsg_SwapBuffersCompleted(route_id_, latency_info,
+                                                    result));
+}
+
+void GpuCommandBufferStub::SendUpdateVSyncParameters(base::TimeTicks timebase,
+                                                     base::TimeDelta interval) {
+  Send(new GpuCommandBufferMsg_UpdateVSyncParameters(route_id_, timebase,
+                                                     interval));
+}
+
+}  // namespace content