Very basic Android browser-side compositing support.

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index 5a339aec3d06e456acf4cd0e72c0c92ab85b4295..60e85e87b4666c942c4c6dd6a2cc9594bcf4afda 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -57,6 +57,12 @@ struct WebIntentData;
 struct WebIntentServiceData;
 }
 
+#if defined(OS_ANDROID)
+namespace WebKit {
+class WebLayer;
+}
+#endif
+
 namespace content {
 
 struct OpenURLParams;
@@ -428,6 +434,10 @@ class CONTENT_EXPORT WebContentsDelegate {
       const MediaStreamRequest* request,
       const MediaResponseCallback& callback) {}
 
+  virtual void AttachLayer(WebContents* web_contents,
+                           WebKit::WebLayer* layer) {}
+  virtual void RemoveLayer(WebContents* web_contents,
+                           WebKit::WebLayer* layer) {}
  protected:
   virtual ~WebContentsDelegate();