Pepper: Define PPB_VideoEncoder API + Implementation

content/common/gpu/gpu_messages.h

 // Copyright (c) 2012 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 <string>
 #include <vector>
 
@@ skipping 690 matching lines @@
 
 // Video decoder has encountered an error.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_ErrorNotification,
                     uint32) /* Error ID */
 
 //------------------------------------------------------------------------------
 // Accelerated Video Encoder Messages
 // These messages are sent from the Renderer process to GPU process.
 
 // Queue a input buffer to the encoder to encode. |frame_id| will be returned by
-// AcceleratedVideoEncoderHostMsg_NotifyEncodeDone.
-IPC_MESSAGE_ROUTED4(AcceleratedVideoEncoderMsg_Encode,
+// AcceleratedVideoEncoderHostMsg_NotifyInputDone.
+IPC_MESSAGE_ROUTED5(AcceleratedVideoEncoderMsg_Encode,
                     int32 /* frame_id */,
                     base::SharedMemoryHandle /* buffer_handle */,
+                    uint32 /* buffer_offset */,
                     uint32 /* buffer_size */,
                     bool /* force_keyframe */)
 
 // Queue a buffer to the encoder for use in returning output.  |buffer_id| will
 // be returned by AcceleratedVideoEncoderHostMsg_BitstreamBufferReady.
 IPC_MESSAGE_ROUTED3(AcceleratedVideoEncoderMsg_UseOutputBitstreamBuffer,
                     int32 /* buffer_id */,
                     base::SharedMemoryHandle /* buffer_handle */,
                     uint32 /* buffer_size */)
 
@@ skipping 24 matching lines @@
                     int32 /* bitstream_buffer_id */,
                     uint32 /* payload_size */,
                     bool /* key_frame */)
 
 // Report error condition.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoEncoderHostMsg_NotifyError,
                     media::VideoEncodeAccelerator::Error /* error */)
 
 // Send destroy request to the encoder.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoEncoderMsg_Destroy)