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

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 228 matching lines @@
       settings.renderer_settings.disable_display_vsync = true;
       settings.wait_for_beginframe_interval = false;
     }
   }
   settings.main_frame_before_activation_enabled =
       cmd->HasSwitch(cc::switches::kEnableMainFrameBeforeActivation) &&
       !cmd->HasSwitch(cc::switches::kDisableMainFrameBeforeActivation);
   settings.accelerated_animation_enabled =
       compositor_deps_->IsThreadedAnimationEnabled();
 
-  settings.use_compositor_animation_timelines =
-      !cmd->HasSwitch(switches::kDisableCompositorAnimationTimelines);
-  blink::WebRuntimeFeatures::enableCompositorAnimationTimelines(
-      settings.use_compositor_animation_timelines);
+  if (cmd->HasSwitch(switches::kEnableCompositorAnimationTimelines)) {
+    settings.use_compositor_animation_timelines = true;
+    blink::WebRuntimeFeatures::enableCompositorAnimationTimelines(true);
+  }
 
   settings.default_tile_size = CalculateDefaultTileSize(widget_);
   if (cmd->HasSwitch(switches::kDefaultTileWidth)) {
     int tile_width = 0;
     GetSwitchValueAsInt(*cmd,
                         switches::kDefaultTileWidth,
                         1,
                         std::numeric_limits<int>::max(),
                         &tile_width);
     settings.default_tile_size.set_width(tile_width);
@@ skipping 827 matching lines @@
   // Ignore what the system said and give all clients the same maximum
   // allocation on desktop platforms.
   actual.bytes_limit_when_visible = 512 * 1024 * 1024;
   actual.priority_cutoff_when_visible =
       gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;
 #endif
   return actual;
 }
 
 }  // namespace content