[Cast] Compute utilization metrics and add performance overlay.

media/cast/sender/external_video_encoder.cc

 // Copyright 2014 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.
 
 #include "media/cast/sender/external_video_encoder.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/shared_memory.h"
@@ skipping 182 matching lines @@
       // Save the bitstream buffer in |stream_header_| to be sent later along
       // with the first key frame.
       //
       // TODO(miu): Should |stream_header_| be an std::ostringstream for
       // performance reasons?
       stream_header_.append(static_cast<const char*>(output_buffer->memory()),
                             payload_size);
     } else if (!in_progress_frame_encodes_.empty()) {
       const InProgressFrameEncode& request = in_progress_frame_encodes_.front();
 
-      scoped_ptr<EncodedFrame> encoded_frame(new EncodedFrame());
+      scoped_ptr<SenderEncodedFrame> encoded_frame(new SenderEncodedFrame());
       encoded_frame->dependency = key_frame ? EncodedFrame::KEY :
           EncodedFrame::DEPENDENT;
       encoded_frame->frame_id = next_frame_id_++;
       if (key_frame)
         encoded_frame->referenced_frame_id = encoded_frame->frame_id;
       else
         encoded_frame->referenced_frame_id = encoded_frame->frame_id - 1;
       encoded_frame->rtp_timestamp = request.rtp_timestamp;
       encoded_frame->reference_time = request.reference_time;
       if (!stream_header_.empty()) {
         encoded_frame->data = stream_header_;
         stream_header_.clear();
       }
       encoded_frame->data.append(
           static_cast<const char*>(output_buffer->memory()), payload_size);
+      // TODO(miu): Compute and populate the |deadline_utilization| and
+      // |lossy_utilization| performance metrics in |encoded_frame|.
 
       cast_environment_->PostTask(
           CastEnvironment::MAIN,
           FROM_HERE,
           base::Bind(&LogFrameEncodedEvent,
                      cast_environment_,
                      cast_environment_->Clock()->NowTicks(),
                      encoded_frame->rtp_timestamp,
                      encoded_frame->frame_id));
 
@@ skipping 235 matching lines @@
       video_config(),
       frame_size(),
       last_frame_id() + 1,
       CreateEncoderStatusChangeCallback(),
       create_vea_cb_,
       create_video_encode_memory_cb_));
 }
 
 }  //  namespace cast
 }  //  namespace media