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,

[jam, 2012/08/30 18:51:54]

this needs to be behind OS_ANDROID as well.

can you move ShouldOverrideLoading down here, so that the ifdef section is
beside each other (the convention in the content api is that platform specific
section is at the end)? and update the cc files where it's implemented so that
they're in the same order.

[no sievers, 2012/08/31 01:31:11]

See comment in render_view_host_delegate.h. I removed the ifdef above.

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