Let ViEEncoder express resolution requests as Sinkwants

webrtc/video/send_statistics_proxy.h

Index: webrtc/video/send_statistics_proxy.h
diff --git a/webrtc/video/send_statistics_proxy.h b/webrtc/video/send_statistics_proxy.h
index 49f0bf383bb292216970bdda595b5ac8a2131ab6..b80474e5fb746b4fe28eb5b3a5a844cedf7a2cdd 100644
--- a/webrtc/video/send_statistics_proxy.h
+++ b/webrtc/video/send_statistics_proxy.h
@@ -40,6 +40,9 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
                             public SendSideDelayObserver {
  public:
   static const int kStatsTimeoutMs;
+  // Number of required UMA samples to be collected before a metric is added
+  // to a UMA histogram.
+  static const int kMinRequiredUMASamples = 200;
 
   SendStatisticsProxy(Clock* clock,
                       const VideoSendStream::Config& config,
@@ -51,7 +54,10 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
   virtual void OnSendEncodedImage(const EncodedImage& encoded_image,
                                   const CodecSpecificInfo* codec_info);
   // Used to update incoming frame rate.
-  void OnIncomingFrame(int width, int height);
+  void OnIncomingFrame(int width, int height, bool is_cpu_restricted);
+
+  void SetCpuRestrictedResolution(bool cpu_restricted);
+  void OnCpuRestrictedResolutionChanged(bool cpu_restricted_resolution);
 
   void OnEncoderStatsUpdate(uint32_t framerate, uint32_t bitrate);
   void OnSuspendChange(bool is_suspended);
@@ -170,6 +176,7 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
     BoolSampleCounter key_frame_counter_;
     BoolSampleCounter quality_limited_frame_counter_;
     SampleCounter quality_downscales_counter_;
+    BoolSampleCounter cpu_limited_frame_counter_;
     BoolSampleCounter bw_limited_frame_counter_;
     SampleCounter bw_resolutions_disabled_counter_;
     SampleCounter delay_counter_;