[Autoplay] Add histogram metrics for cross-origin autoplay muted experiment

third_party/WebKit/Source/core/html/AutoplayUmaHelper.h

 // Copyright 2016 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.
 
 #ifndef AutoplayUmaHelper_h
 #define AutoplayUmaHelper_h
 
 #include "core/CoreExport.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventListener.h"
@@ skipping 23 matching lines @@
 // These values are used for histograms. Do not reorder.
 enum AutoplayBlockedReason {
   AutoplayBlockedReasonDataSaver = 0,
   AutoplayBlockedReasonSetting = 1,
   AutoplayBlockedReasonDataSaverAndSetting = 2,
   // Keey at the end.
   AutoplayBlockedReasonMax = 3
 };
 
 enum class CrossOriginAutoplayResult {
-  AutoplayAllowed,
-  AutoplayBlocked,
-  PlayedWithGesture,
+  AutoplayAllowed = 0,
+  AutoplayBlocked = 1,
+  PlayedWithGesture = 2,
+  UserPaused = 3,
+  // Keep at the end.
+  NumberOfResults = 4,
 };
 
 class Document;
 class ElementVisibilityObserver;
 class HTMLMediaElement;
 
 class CORE_EXPORT AutoplayUmaHelper : public EventListener,
                                       public ContextLifecycleObserver {
   USING_GARBAGE_COLLECTED_MIXIN(AutoplayUmaHelper);
 
@@ skipping 66 matching lines @@
   int64_t m_mutedVideoAutoplayOffscreenStartTimeMS;
 
   // The duration an autoplaying muted video has been in offscreen.
   int64_t m_mutedVideoAutoplayOffscreenDurationMS;
 
   // Whether an autoplaying muted video is visible.
   bool m_isVisible;
 
   std::set<CrossOriginAutoplayResult> m_recordedCrossOriginAutoplayResults;
 
-  // Whether the UMA helper has recorded user pausing a cross-origin video.
-  bool m_hasRecordedUserPausedAutoplayingCrossOriginVideo;
-
   // The observer is used to observer an autoplaying muted video changing it's
   // visibility, which is used for offscreen duration UMA.  The UMA is pending
   // for recording as long as this observer is non-null.
   Member<ElementVisibilityObserver>
       m_mutedVideoOffscreenDurationVisibilityObserver;
 };
 
 }  // namespace blink
 
 #endif  // AutoplayUmaHelper_h