[Mojo Video Capture] Replace RESOURCE_UTILIZATION with interface ReceiverLoadObserver

media/capture/content/video_capture_oracle.cc

 // Copyright (c) 2015 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/capture/content/video_capture_oracle.h"
 
 #include <algorithm>
 
 #include "base/format_macros.h"
 #include "base/numerics/safe_conversions.h"
@@ skipping 196 matching lines @@
     const base::TimeDelta time_since_last_change =
         event_time - buffer_pool_utilization_.reset_time();
     if (time_since_last_change.InMicroseconds() >= kMinSizeChangePeriodMicros)
       CommitCaptureSizeAndReset(GetFrameTimestamp(next_frame_number_ - 1));
   }
 
   SetFrameTimestamp(next_frame_number_, event_time);
   return true;
 }
 
-int VideoCaptureOracle::RecordCapture(double pool_utilization) {
+int VideoCaptureOracle::next_frame_number() const {
+  return next_frame_number_;
+}
+
+void VideoCaptureOracle::RecordCapture(double pool_utilization) {
   DCHECK(std::isfinite(pool_utilization) && pool_utilization >= 0.0);
 
   smoothing_sampler_.RecordSample();
   const base::TimeTicks timestamp = GetFrameTimestamp(next_frame_number_);
   content_sampler_.RecordSample(timestamp);
 
   if (auto_throttling_enabled_) {
     buffer_pool_utilization_.Update(pool_utilization, timestamp);
     AnalyzeAndAdjust(timestamp);
   }
 
   num_frames_pending_++;
-  return next_frame_number_++;
+  next_frame_number_++;
 }
 
 void VideoCaptureOracle::RecordWillNotCapture(double pool_utilization) {
   VLOG(1) << "Client rejects proposal to capture frame (at #"
           << next_frame_number_ << ").";
 
   if (auto_throttling_enabled_) {
     DCHECK(std::isfinite(pool_utilization) && pool_utilization >= 0.0);
     const base::TimeTicks timestamp = GetFrameTimestamp(next_frame_number_);
     buffer_pool_utilization_.Update(pool_utilization, timestamp);
@@ skipping 307 matching lines @@
   // Content is not animating, so permit an immediate increase in the capture
   // area.  This allows the system to quickly improve the quality of
   // non-animating content (frame drops are not much of a concern).
   VLOG(2) << "Proposing a "
           << (100.0 * (increased_area - current_area) / current_area)
           << "% increase in capture area for non-animating content.  :-)";
   return increased_area;
 }
 
 }  // namespace media