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..6d161aee3a0b7e0dc5b6d0db2ae222be21433006 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)

[jam, 2012/09/04 16:44:48]

ditto

+namespace WebKit {
+class WebLayer;
+}
+#endif
+
 namespace content {
 
 struct OpenURLParams;
@@ -307,12 +313,6 @@ class CONTENT_EXPORT WebContentsDelegate {
   // changed.
   virtual void ContentRestrictionsChanged(WebContents* source) {}
 
-#if defined(OS_ANDROID)
-  // Returns true if the delegate wants to handle the url instead. Default
-  // returns false.
-  virtual bool ShouldOverrideLoading(const GURL& url);
-#endif
-
   // Notification that the tab is hung.
   virtual void RendererUnresponsive(WebContents* source) {}
 
@@ -428,6 +428,16 @@ class CONTENT_EXPORT WebContentsDelegate {
       const MediaStreamRequest* request,
       const MediaResponseCallback& callback) {}
 
+#if defined(OS_ANDROID)
+  // Returns true if the delegate wants to handle the url instead. Default
+  // returns false.
+  virtual bool ShouldOverrideLoading(const GURL& url);
+  virtual void AttachLayer(WebContents* web_contents,

[jam, 2012/09/04 16:44:48]

nit: document these methods

+                           WebKit::WebLayer* layer) {}
+  virtual void RemoveLayer(WebContents* web_contents,
+                           WebKit::WebLayer* layer) {}
+#endif
+
  protected:
   virtual ~WebContentsDelegate();