Initialize and set compositor thread in WebKit initialization

content/renderer/render_thread.cc

Index: content/renderer/render_thread.cc
diff --git a/content/renderer/render_thread.cc b/content/renderer/render_thread.cc
index 53332b98e5919fcf17220ede39c4245435a97206..6c74d2bb2394bad821f61c8cca1186239479e6a7 100644
--- a/content/renderer/render_thread.cc
+++ b/content/renderer/render_thread.cc
@@ -69,6 +69,11 @@
 #include "v8/include/v8.h"
 #include "webkit/extensions/v8/playback_extension.h"
 #include "webkit/glue/webkit_glue.h"
+#include "webkit/glue/webthread_impl.h"
+
+#ifdef HAVE_WEBCOMPOSITOR
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebCompositor.h"
+#endif
 
 // TODO(port)
 #if defined(OS_WIN)
@@ -438,6 +443,11 @@ void RenderThread::EnsureWebKitInitialized() {
   webkit_platform_support_.reset(new RendererWebKitPlatformSupportImpl);
   WebKit::initialize(webkit_platform_support_.get());
 
+#ifdef HAVE_WEBCOMPOSITOR
+  compositor_thread_.reset(new webkit_glue::WebThreadImpl("Compositor"));
+  WebKit::WebCompositor::setThread(compositor_thread_.get());
+#endif
+
   WebScriptController::enableV8SingleThreadMode();
 
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();