Very basic Android browser-side compositing support.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index c14fc788b49a437a435971a4504d55e7281c1f49..cbe5e0a543c01735d9be8629bd68dfac4f1bbefe 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -47,6 +47,10 @@ class Rect;
 class Size;
 }
 
+namespace WebKit {
+class WebLayer;

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

I can't see this class in WebKit tree yet, so I'm guessing it hasn't landed. I
can't tell whether this type exists for all platforms or just android? I.e.
whether this needs an ifdef or not, also same below and in other files

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

Actually this exists for all platforms in
third_party/WebKit/Source/Platform/chromium/public/WebLayer.h

I'll just remove the accidental ifdef in web_contents_delegate.h, ok?

+}
+
 namespace content {
 
 class BrowserContext;
@@ -409,6 +413,9 @@ class CONTENT_EXPORT RenderViewHostDelegate {
       const MediaStreamRequest* request,
       const MediaResponseCallback& callback) {}
 
+  virtual void AttachLayer(WebKit::WebLayer* layer) {}
+  virtual void RemoveLayer(WebKit::WebLayer* layer) {}
+
  protected:
   virtual ~RenderViewHostDelegate() {}
 };