Replace context parenting by sharing through mailboxes

gpu/command_buffer/service/gles2_cmd_decoder.h

Index: gpu/command_buffer/service/gles2_cmd_decoder.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.h b/gpu/command_buffer/service/gles2_cmd_decoder.h
index 15f3e97adbded495e5c2aa1b48fcb11a29868a54..b187b58abe5fefd3a4275a3c305037b5f3a7fef8 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.h
@@ -28,6 +28,7 @@ namespace gpu {
 class AsyncPixelTransferDelegate;
 class AsyncPixelTransferManager;
 class StreamTextureManager;
+struct Mailbox;
 
 namespace gles2 {
 
@@ -121,8 +122,7 @@ class GPU_EXPORT GLES2Decoder : public base::SupportsWeakPtr<GLES2Decoder>,
   // Set the surface associated with the default FBO.
   virtual void SetSurface(const scoped_refptr<gfx::GLSurface>& surface) = 0;
 
-  virtual bool SetParent(GLES2Decoder* parent_decoder,
-                         uint32 parent_texture_id) = 0;
+  virtual bool ProduceFrontBuffer(const Mailbox& mailbox) = 0;
 
   // Resize an offscreen frame buffer.
   virtual bool ResizeOffscreenFrameBuffer(const gfx::Size& size) = 0;