Add an additional VDA::Flush() mode to return all allocated buffers.

content/common/gpu/media/media_messages.h

 // Copyright 2016 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.
 
 // Multiply-included message file, hence no include guard here, but see below
 // for a much smaller-than-usual include guard section.
 
 #include "content/common/content_export.h"
 #include "content/common/gpu/media/create_video_encoder_params.h"
 #include "gpu/config/gpu_info.h"
@@ skipping 121 matching lines @@
 IPC_MESSAGE_ROUTED2(AcceleratedVideoDecoderMsg_AssignPictureBuffers,
                     std::vector<int32_t>,  /* Picture buffer ID */
                     std::vector<uint32_t>) /* Texture ID */
 
 // Send from Renderer process to the GPU process to recycle the given picture
 // buffer for further decoding.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderMsg_ReusePictureBuffer,
                     int32_t) /* Picture buffer ID */
 
 // Send flush request to the decoder.
-IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderMsg_Flush)
+IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderMsg_Flush,
+                    bool /* return_buffers */)
 
 // Send reset request to the decoder.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderMsg_Reset)
 
 // Send destroy request to the decoder.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderMsg_Destroy)
 
 //------------------------------------------------------------------------------
 // Accelerated Video Decoder Host Messages
 // These messages are sent from GPU process to Renderer process.
@@ skipping 124 matching lines @@
 IPC_MESSAGE_ROUTED0(AcceleratedJpegDecoderMsg_Destroy)
 
 //------------------------------------------------------------------------------
 // Accelerated JPEG Decoder Host Messages
 // These messages are sent from the GPU process to Browser process.
 //
 // Report decode status.
 IPC_MESSAGE_ROUTED2(AcceleratedJpegDecoderHostMsg_DecodeAck,
                     int32_t, /* bitstream_buffer_id */
                     media::JpegDecodeAccelerator::Error /* error */)