Revert of CC Animations: Enable external animation host for blink.

content/renderer/render_thread_impl.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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 635 matching lines @@
   GetContentClient()->renderer()->RenderThreadStarted();
 
   InitSkiaEventTracer();
   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
       skia::SkiaMemoryDumpProvider::GetInstance());
 
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
   cc::LayerSettings layer_settings;
-  layer_settings.use_compositor_animation_timelines =
-      !command_line.HasSwitch(switches::kDisableCompositorAnimationTimelines);
+  if (command_line.HasSwitch(switches::kEnableCompositorAnimationTimelines))
+    layer_settings.use_compositor_animation_timelines = true;
   cc_blink::WebLayerImpl::SetLayerSettings(layer_settings);
   cc::SetClientNameForMetrics("Renderer");
 
   is_threaded_animation_enabled_ =
       !command_line.HasSwitch(cc::switches::kDisableThreadedAnimation);
 
   is_zero_copy_enabled_ = command_line.HasSwitch(switches::kEnableZeroCopy);
   is_persistent_gpu_memory_buffer_enabled_ =
       command_line.HasSwitch(switches::kEnablePersistentGpuMemoryBuffer);
 
@@ skipping 1323 matching lines @@
 }
 
 void RenderThreadImpl::PendingRenderFrameConnect::OnConnectionError() {
   size_t erased =
       RenderThreadImpl::current()->pending_render_frame_connects_.erase(
           routing_id_);
   DCHECK_EQ(1u, erased);
 }
 
 }  // namespace content