Enable CSS Blending support under the webkit experimental features chromium flag.

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 763 matching lines @@
       !command_line.HasSwitch(switches::kDisableJavaScriptI18NAPI));
 
   WebRuntimeFeatures::enableQuota(true);
 
   if (command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures)) {
     WebRuntimeFeatures::enableStyleScoped(true);
     WebRuntimeFeatures::enableCustomDOMElements(true);
     WebRuntimeFeatures::enableCSSExclusions(true);
     WebRuntimeFeatures::enableExperimentalContentSecurityPolicyFeatures(true);
     WebRuntimeFeatures::enableCSSRegions(true);
+    WebRuntimeFeatures::enableCSSCompositing(true);
     WebRuntimeFeatures::enableDialogElement(true);
     WebRuntimeFeatures::enableFontLoadEvents(true);
   }
 
   WebRuntimeFeatures::enableSeamlessIFrames(
       command_line.HasSwitch(switches::kEnableExperimentalWebKitFeatures));
 
   // Enabled by default for testing.
   // TODO(urvang): Go back to using the command-line option after a few days.
   WebRuntimeFeatures::enableWebPInAcceptHeader(true);
@@ skipping 522 matching lines @@
 
 void RenderThreadImpl::SetFlingCurveParameters(
     const std::vector<float>& new_touchpad,
     const std::vector<float>& new_touchscreen) {
   webkit_platform_support_->SetFlingCurveParameters(new_touchpad,
                                                     new_touchscreen);
 
 }
 
 }  // namespace content