Allow both Context3D and Graphics3D with the video decoder

ppapi/shared_impl/video_decoder_impl.h

Index: ppapi/shared_impl/video_decoder_impl.h
diff --git a/ppapi/shared_impl/video_decoder_impl.h b/ppapi/shared_impl/video_decoder_impl.h
index ff19d091294b0103d481d8e8a2d099082edfa272..048b0c80590e731ff3149bc76fe137a441b31edd 100644
--- a/ppapi/shared_impl/video_decoder_impl.h
+++ b/ppapi/shared_impl/video_decoder_impl.h
@@ -57,10 +57,9 @@ class PPAPI_SHARED_EXPORT VideoDecoderImpl
   // Tell command buffer to process all commands it has received so far.
   void FlushCommandBuffer();
 
-  // Initialize the underlying decoder and return success status.
-  virtual bool Init(PP_Resource context3d_id,
-                    thunk::PPB_Context3D_API* context,
-                    const PP_VideoConfigElement* dec_config);
+  // Initialize the underlying decoder.
+  void InitCommon(PP_Resource context3d_id,
+                  gpu::gles2::GLES2Implementation* gles2_impl);
 
  private:
   // Key: bitstream_buffer_id, value: callback to run when bitstream decode is