Prepare Chromium for WebCompositor::initialize.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index f74e1f534623f4f2360674f49808287e5f431ebc..656aa095a5650ea458ca667057eae97d71a9a6e8 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -245,6 +245,9 @@ RenderThreadImpl::~RenderThreadImpl() {
   if (file_thread_.get())
     file_thread_->Stop();
 
+#if WEBCOMPOSITOR_HAS_INITIALIZE
+  WebCompositor::shutdown();
+#endif
   if (compositor_thread_.get()) {
     RemoveFilter(compositor_thread_->GetMessageFilter());
     compositor_thread_.reset();
@@ -433,6 +436,15 @@ void RenderThreadImpl::EnsureWebKitInitialized() {
       switches::kEnableThreadedCompositing)) {
     compositor_thread_.reset(new CompositorThread(this));
     AddFilter(compositor_thread_->GetMessageFilter());
+#if WEBCOMPOSITOR_HAS_INITIALIZE
+    WebCompositor::initialize(compositor_thread_->GetWebThread());
+#else
+    WebCompositor::setThread(compositor_thread_->GetWebThread());
+#endif
+  } else {
+#if WEBCOMPOSITOR_HAS_INITIALIZE
+    WebCompositor::initialize(NULL);
+#endif
   }
 
   WebScriptController::enableV8SingleThreadMode();