compositor-worker: Add CompositorProxyClient worker client of CompositorWorker.

third_party/WebKit/Source/web/ChromeClientImpl.cpp

Index: third_party/WebKit/Source/web/ChromeClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/ChromeClientImpl.cpp b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
index ab5b0e7b38da10ede99bb915ea7f6405b1e21267..b6b0a5858bd2a66c804118ef614637a9fa8c2202 100644
--- a/third_party/WebKit/Source/web/ChromeClientImpl.cpp
+++ b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
@@ -1073,6 +1073,12 @@ void ChromeClientImpl::didUpdateTopControls() const
     m_webView->didUpdateTopControls();
 }
 
+CompositorProxyClient* ChromeClientImpl::createCompositorProxyClient(LocalFrame* frame)
+{
+    WebLocalFrameImpl* webFrame = WebLocalFrameImpl::fromFrame(frame);
+    return webFrame->localRoot()->frameWidget()->createCompositorProxyClient();
+}
+
 void ChromeClientImpl::registerPopupOpeningObserver(PopupOpeningObserver* observer)
 {
     DCHECK(observer);