Merge 114475 - [chromium] Ensure RateLimiter waits for Swapbuffers completion

Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp

Index: Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp
===================================================================
--- Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp	(revision 114962)
+++ Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp	(working copy)
@@ -283,6 +283,15 @@
     }
 }
 
+void CCSingleThreadProxy::forceSerializeOnSwapBuffers()
+{
+    {
+        DebugScopedSetImplThread impl;
+        if (m_layerRendererInitialized)
+            m_layerTreeHostImpl->layerRenderer()->doNoOp();
+    }
+}
+
 bool CCSingleThreadProxy::commitIfNeeded()
 {
     ASSERT(CCProxy::isMainThread());