remoting: remove usage of CapturedFrame.elapsed_time in CastVideoCapturerAdapter

remoting/host/cast_video_capturer_adapter.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 "remoting/host/cast_video_capturer_adapter.h"
 
 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 
 namespace remoting {
 
@@ skipping 27 matching lines @@
   if (!owned_frame || owned_frame->updated_region().is_empty()) {
     owned_frame.reset();
     return;
   }
 
   // Convert the webrtc::DesktopFrame to a cricket::CapturedFrame.
   cricket::CapturedFrame captured_frame;
   captured_frame.width = owned_frame->size().width();
   captured_frame.height = owned_frame->size().height();
   base::TimeTicks current_time = base::TimeTicks::Now();
-  captured_frame.elapsed_time = (current_time - start_time_).InMicroseconds() *
-                                base::Time::kNanosecondsPerMicrosecond;
   captured_frame.time_stamp =
       current_time.ToInternalValue() * base::Time::kNanosecondsPerMicrosecond;
   captured_frame.data = owned_frame->data();
 
   // The data_size attribute must be set. If multiple formats are supported,
   // this should be set appropriately for each one.
   captured_frame.data_size =
       (captured_frame.width * webrtc::DesktopFrame::kBytesPerPixel * 8 + 7) /
       8 * captured_frame.height;
   captured_frame.fourcc = cricket::FOURCC_ARGB;
@@ skipping 24 matching lines @@
     VLOG(1) << "CastVideoCapturerAdapter failed to start.";
     return cricket::CS_FAILED;
   }
 
   // This is required to tell the cricket::VideoCapturer base class what the
   // capture format will be.
   SetCaptureFormat(&capture_format);
 
   desktop_capturer_->Start(this);
 
-  // Save the Start() time of |desktop_capturer_|. This will be used
-  // to estimate the creation time of the frame source, to set the elapsed_time
-  // of future CapturedFrames in OnCaptureCompleted().
-  start_time_ = base::TimeTicks::Now();
   capture_timer_.reset(new base::RepeatingTimer());
   capture_timer_->Start(FROM_HERE,
                         base::TimeDelta::FromMicroseconds(
                             GetCaptureFormat()->interval /
                             (base::Time::kNanosecondsPerMicrosecond)),
                         this,
                         &CastVideoCapturerAdapter::CaptureNextFrame);
 
   return cricket::CS_RUNNING;
 }
@@ skipping 84 matching lines @@
 void CastVideoCapturerAdapter::CaptureNextFrame() {
   // If we are paused, then don't capture.
   if (!IsRunning())
     return;
 
   desktop_capturer_->Capture(webrtc::DesktopRegion());
 }
 
 }  // namespace remoting