cc: Remove the unused compositor thread variable and interface.

ui/compositor/compositor.cc

 // 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 "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 54 matching lines @@
   compositor_ = NULL;
 }
 
 Compositor::Compositor(gfx::AcceleratedWidget widget,
                        ui::ContextFactory* context_factory,
                        scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : context_factory_(context_factory),
       root_layer_(NULL),
       widget_(widget),
       surface_id_allocator_(context_factory->CreateSurfaceIdAllocator()),
-      compositor_thread_loop_(context_factory->GetCompositorMessageLoop()),
       task_runner_(task_runner),
       vsync_manager_(new CompositorVSyncManager()),
       device_scale_factor_(0.0f),
       last_started_frame_(0),
       last_ended_frame_(0),
       num_failed_recreate_attempts_(0),
       disable_schedule_composite_(false),
       compositor_lock_(NULL),
       layer_animator_collection_(this),
       weak_ptr_factory_(this) {
@@ skipping 44 matching lines @@
       command_line->HasSwitch(cc::switches::kUIShowReplicaScreenSpaceRects);
 
   settings.initial_debug_state.SetRecordRenderingStats(
       command_line->HasSwitch(cc::switches::kEnableGpuBenchmarking));
 
   settings.impl_side_painting = IsUIImplSidePaintingEnabled();
   settings.use_zero_copy = IsUIZeroCopyEnabled();
   settings.hud_typeface = ui::GetHudTypeface();
 
   base::TimeTicks before_create = base::TimeTicks::Now();
-  if (compositor_thread_loop_.get()) {
-    host_ = cc::LayerTreeHost::CreateThreaded(
-        this,
-        context_factory_->GetSharedBitmapManager(),
-        context_factory_->GetGpuMemoryBufferManager(),
-        settings,
-        task_runner_,
-        compositor_thread_loop_,
-        nullptr);
-  } else {
-    host_ = cc::LayerTreeHost::CreateSingleThreaded(
-        this,
-        this,
-        context_factory_->GetSharedBitmapManager(),
-        context_factory_->GetGpuMemoryBufferManager(),
-        settings,
-        task_runner_,
-        nullptr);
-  }
+  host_ = cc::LayerTreeHost::CreateSingleThreaded(
+      this, this, context_factory_->GetSharedBitmapManager(),
+      context_factory_->GetGpuMemoryBufferManager(), settings, task_runner_,
+      nullptr);
   UMA_HISTOGRAM_TIMES("GPU.CreateBrowserCompositor",
                       base::TimeTicks::Now() - before_create);
   host_->SetRootLayer(root_web_layer_);
   host_->set_surface_id_namespace(surface_id_allocator_->id_namespace());
   host_->SetLayerTreeHostClientReady();
 }
 
 Compositor::~Compositor() {
   TRACE_EVENT0("shutdown", "Compositor::destructor");
 
@@ skipping 178 matching lines @@
   DCHECK(!IsLocked());
   FOR_EACH_OBSERVER(CompositorObserver,
                     observer_list_,
                     OnCompositingDidCommit(this));
 }
 
 void Compositor::DidCommitAndDrawFrame() {
 }
 
 void Compositor::DidCompleteSwapBuffers() {
-  // DidPostSwapBuffers is a SingleThreadProxy-only feature.  Synthetically
-  // generate OnCompositingStarted messages for the threaded case so that
-  // OnCompositingStarted/OnCompositingEnded messages match.
-  if (compositor_thread_loop_.get()) {
-    base::TimeTicks start_time = gfx::FrameTime::Now();
-    FOR_EACH_OBSERVER(CompositorObserver, observer_list_,
-                      OnCompositingStarted(this, start_time));
-  }
   FOR_EACH_OBSERVER(CompositorObserver, observer_list_,
                     OnCompositingEnded(this));
 }
 
 void Compositor::DidPostSwapBuffers() {
   base::TimeTicks start_time = gfx::FrameTime::Now();
   FOR_EACH_OBSERVER(CompositorObserver, observer_list_,
                     OnCompositingStarted(this, start_time));
 }
 
@@ skipping 35 matching lines @@
                     observer_list_,
                     OnCompositingLockStateChanged(this));
 }
 
 void Compositor::CancelCompositorLock() {
   if (compositor_lock_)
     compositor_lock_->CancelLock();
 }
 
 }  // namespace ui