work-in-progress patch to fix context lost black video

content/renderer/media/android/stream_texture_factory.h

 // Copyright 2014 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_RENDERER_MEDIA_ANDROID_STREAM_TEXTURE_FACTORY_H_
 #define CONTENT_RENDERER_MEDIA_ANDROID_STREAM_TEXTURE_FACTORY_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop_proxy.h"
 #include "cc/layers/video_frame_provider.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "ui/gfx/size.h"
 
 namespace gpu {
 namespace gles2 {
 class GLES2Interface;
 }  // namespace gles2
 }  // namespace gpu
 
 namespace content {
 
 // The proxy class for the gpu thread to notify the compositor thread
 // when a new video frame is available.
 class StreamTextureProxy {
  public:
   virtual ~StreamTextureProxy() {}
 
-  // Initialize and bind to the current thread, which becomes the thread that
-  // a connected client will receive callbacks on.
-  virtual void BindToCurrentThread(int32 stream_id) = 0;
-
-  // Setting the target for callback when a frame is available. This function
-  // could be called on both the main thread and the compositor thread.
-  virtual void SetClient(cc::VideoFrameProvider::Client* client) = 0;
+  // Initialize and bind to the loop, which becomes the thread that
+  // a connected client will receive callbacks on. This can be called
+  // on any thread but should only be called on that thread from that
+  // point on.
+  virtual void Bind(int32 stream_id,
+                    cc::VideoFrameProvider::Client* client,
+                    scoped_refptr<base::MessageLoopProxy> loop) = 0;
 
   // Causes this instance to be deleted on the thread it is bound to.
   virtual void Release() = 0;
 
   struct Deleter {
     inline void operator()(StreamTextureProxy* ptr) const { ptr->Release(); }
   };
 };
 
 typedef scoped_ptr<StreamTextureProxy, StreamTextureProxy::Deleter>
     ScopedStreamTextureProxy;
 
+class StreamTextureFactoryContextObserver {
+ public:
+  ~StreamTextureFactoryContextObserver() {}
+  virtual void ResetStreamTextureProxy() = 0;
+};
+
 // Factory class for managing stream textures.
 class StreamTextureFactory : public base::RefCounted<StreamTextureFactory> {
  public:
   // Create the StreamTextureProxy object.
   virtual StreamTextureProxy* CreateProxy() = 0;
 
   // Send an IPC message to the browser process to request a java surface
   // object for the given stream_id. After the the surface is created,
   // it will be passed back to the WebMediaPlayerAndroid object identified by
   // the player_id.
   virtual void EstablishPeer(int32 stream_id, int player_id) = 0;
 
   // Creates a StreamTexture and returns its id.  Sets |*texture_id| to the
   // client-side id of the StreamTexture. The texture is produced into
   // a mailbox so it can be shipped in a VideoFrame.
   virtual unsigned CreateStreamTexture(unsigned texture_target,
                                        unsigned* texture_id,
                                        gpu::Mailbox* texture_mailbox) = 0;
 
   // Set the streamTexture size for the given stream Id.
   virtual void SetStreamTextureSize(int32 texture_id,
                                     const gfx::Size& size) = 0;
 
   virtual gpu::gles2::GLES2Interface* ContextGL() = 0;
 
+  virtual void AddObserver(StreamTextureFactoryContextObserver* obs) = 0;
+  virtual void RemoveObserver(StreamTextureFactoryContextObserver* obs) = 0;
+
  protected:
   friend class base::RefCounted<StreamTextureFactory>;
   virtual ~StreamTextureFactory() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_ANDROID_STREAM_TEXTURE_FACTORY_H_