Very basic Android browser-side compositing support.

content/public/browser/web_contents_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 39 matching lines @@
 
 namespace history {
 class HistoryAddPageArgs;
 }
 
 namespace webkit_glue {
 struct WebIntentData;
 struct WebIntentServiceData;
 }
 
+#if defined(OS_ANDROID)
+namespace WebKit {
+class WebLayer;
+}
+#endif
+
 namespace content {
 
 struct OpenURLParams;
 
 typedef base::Callback< void(const MediaStreamDevices&) > MediaResponseCallback;
 
 // Objects implement this interface to get notified about changes in the
 // WebContents and to provide necessary functionality.
 class CONTENT_EXPORT WebContentsDelegate {
  public:
@@ skipping 351 matching lines @@
   // Asks permission to use the camera and/or microphone. If permission is
   // granted, a call should be made to |callback| with the devices. If the
   // request is denied, a call should be made to |callback| with an empty list
   // of devices. |request| has the details of the request (e.g. which of audio
   // and/or video devices are requested, and lists of available devices).
   virtual void RequestMediaAccessPermission(
       WebContents* web_contents,
       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();
 
  private:
   friend class ::WebContentsImpl;
 
   // Called when |this| becomes the WebContentsDelegate for |source|.
   void Attach(WebContents* source);
 
   // Called when |this| is no longer the WebContentsDelegate for |source|.
   void Detach(WebContents* source);
 
   // The WebContents that this is currently a delegate for.
   std::set<WebContents*> attached_contents_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_