Add UMA histograms for more detailed latency tracking on the CRD host.

remoting/codec/video_encoder_verbatim.cc

 // 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.
 
 #include "remoting/codec/video_encoder_verbatim.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
-#include "base/time/time.h"
 #include "remoting/base/util.h"
 #include "remoting/proto/video.pb.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
 
 namespace remoting {
 
 static uint8_t* GetPacketOutputBuffer(VideoPacket* packet, size_t size) {
   packet->mutable_data()->resize(size);
   return reinterpret_cast<uint8_t*>(string_as_array(packet->mutable_data()));
 }
 
 VideoEncoderVerbatim::VideoEncoderVerbatim() {}
 VideoEncoderVerbatim::~VideoEncoderVerbatim() {}
 
 scoped_ptr<VideoPacket> VideoEncoderVerbatim::Encode(
     const webrtc::DesktopFrame& frame) {
   DCHECK(frame.data());
 
   // If nothing has changed in the frame then return NULL to indicate that
   // we don't need to actually send anything (e.g. nothing to top-off).
   if (frame.updated_region().is_empty())
     return nullptr;
 
-  base::Time encode_start_time = base::Time::Now();
-
   // Create a VideoPacket with common fields (e.g. DPI, rects, shape) set.
   scoped_ptr<VideoPacket> packet(helper_.CreateVideoPacket(frame));
   packet->mutable_format()->set_encoding(VideoPacketFormat::ENCODING_VERBATIM);
 
   // Calculate output size.
   size_t output_size = 0;
   for (webrtc::DesktopRegion::Iterator iter(frame.updated_region());
        !iter.IsAtEnd(); iter.Advance()) {
     const webrtc::DesktopRect& rect = iter.rect();
     output_size += rect.width() * rect.height() *
@@ skipping 10 matching lines @@
     const int row_size = webrtc::DesktopFrame::kBytesPerPixel * rect.width();
     const uint8_t* in = frame.data() + rect.top() * in_stride +
                         rect.left() * webrtc::DesktopFrame::kBytesPerPixel;
     for (int y = rect.top(); y < rect.top() + rect.height(); ++y) {
       memcpy(out, in, row_size);
       out += row_size;
       in += in_stride;
     }
   }
 
-  // Note the time taken to encode the pixel data.
-  packet->set_encode_time_ms(
-      (base::Time::Now() - encode_start_time).InMillisecondsRoundedUp());
-
   return packet.Pass();
 }
 
 }  // namespace remoting