Add histogram for percentage of sent frames that are limited in resolution due to bandwidth.

webrtc/video_frame.h

Index: webrtc/video_frame.h
diff --git a/webrtc/video_frame.h b/webrtc/video_frame.h
index 1968a69b0b2e3df4aca2e0d8ceb608c58ccfb6ed..821bfc25514034007363144bb70981759f687510 100644
--- a/webrtc/video_frame.h
+++ b/webrtc/video_frame.h
@@ -167,6 +167,7 @@ class VideoFrame {
   VideoRotation rotation_;
 };
 
+
 // TODO(pbos): Rename EncodedFrame and reformat this class' members.
 class EncodedImage {
  public:
@@ -176,11 +177,15 @@ class EncodedImage {
 
   struct AdaptReason {
     AdaptReason()
-        : quality_resolution_downscales(-1) {}
+        : quality_resolution_downscales(-1),
+          bw_resolutions_disabled(-1) {}
 
     int quality_resolution_downscales;  // Number of times this frame is down
                                         // scaled in resolution due to quality.
                                         // Or -1 if information is not provided.
+    int bw_resolutions_disabled;  // Number of resolutions that are not sent
+                                  // due to bandwidth for this frame.
+                                  // Or -1 if information is not provided.
   };
   uint32_t _encodedWidth = 0;
   uint32_t _encodedHeight = 0;