Use explicit flush for ArcVideoAccelerator.

components/arc/common/video_accelerator.mojom

 // 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.
 
 // This file defined the mojo interface between Android and Chromium for video
 // decoding and encoding. See comments of ArcVideoAccelerator for more info.
 
 module arc.mojom;
 
 [Extensible]
 enum HalPixelFormatExtension {
   HAL_PIXEL_FORMAT_YCbCr_420_888 = 0x23,
   HAL_PIXEL_FORMAT_H264 = 0x34363248,
   HAL_PIXEL_FORMAT_VP8 = 0x00385056,
 };
 
 enum PortType {
   PORT_INPUT = 0,
   PORT_OUTPUT = 1,
 };
 
-[Extensible]
-enum BufferFlag {
-  BUFFER_FLAG_EOS = 1,
-};
-
 struct BufferMetadata {
   int64 timestamp;  // in microseconds
-  uint32 flags;
   uint32 bytes_used;
 };
 
 struct VideoFormat {
   uint32 pixel_format;
   uint32 buffer_size;
 
   // minimal number of buffers required to process the video.
   uint32 min_num_buffers;
   uint32 coded_width;
@@ skipping 21 matching lines @@
   BindSharedMemory@1(PortType port, uint32 index, handle ashmem_fd,
                    uint32 offset, uint32 length);
 
   BindDmabuf@2(PortType port, uint32 index, handle dmabuf_fd);
 
   UseBuffer@3(PortType port, uint32 index, BufferMetadata metadata);
 
   SetNumberOfOutputBuffers@4(uint32 number);
 
   Reset@5();
+
+  Flush@6();
 };
 
 interface VideoAcceleratorServiceClient {
   enum Error {
     NO_ERROR = 0,
     ILLEGAL_STATE = 1,
     INVALID_ARGUMENT = 2,
     UNREADABLE_INPUT = 3,
     PLATFORM_FAILURE = 4,
   };
 
   Init@0(VideoAcceleratorService service_ptr);
 
   OnError@1(Error error);
 
   OnBufferDone@2(PortType port, uint32 index, BufferMetadata metadata);
 
   OnResetDone@3();
 
   OnOutputFormatChanged@4(VideoFormat format);
+
+  OnFlushDone@5();
 };