Autoplay experiment metric fixes and additions.

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

Index: third_party/WebKit/Source/core/html/AutoplayExperimentHelper.h
diff --git a/third_party/WebKit/Source/core/html/AutoplayExperimentHelper.h b/third_party/WebKit/Source/core/html/AutoplayExperimentHelper.h
index a35406017692312b1c2aab08fc8c726e0ca14326..6d69a56deeb700e5e1df2f047edf7fd101e85100 100644
--- a/third_party/WebKit/Source/core/html/AutoplayExperimentHelper.h
+++ b/third_party/WebKit/Source/core/html/AutoplayExperimentHelper.h
@@ -62,6 +62,29 @@ enum AutoplayMetrics {
     AnyPlaybackPaused = 12,
     // Some playback, whether user initiated or not, bailed out early.
     AnyPlaybackBailout = 13,
+    // Some playback, whether user initiated or not, played to completion.
+    AnyPlaybackComplete = 14,
+
+    // Number of audio elements detected.

[philipj_slow, 2015/11/26 15:30:56]

Clarify that this is only elements that reached the resource fetch algorithm?

[liberato (no reviews please), 2015/12/02 00:58:08]

Done.

+    AnyAudioElement = 15,
+    // Numer of video elements detected.
+    AnyVideoElement = 16,
+
+    // User gesture was bypassed, and playback started, and media played to
+    // completion without a user-initiated pause.
+    AutoplayComplete = 17,
+
+    // Autoplay started after the gesture requirement was removed by a
+    // user gesture load().
+    GesturelessPlaybackEnabledByLoad = 18,
+
+    // Gestureless playback started after the gesture requirement was removed
+    // because src is media stream.
+    GesturelessPlaybackEnabledByStream = 19,
+
+    // Gestureless playback was started, but it is unknown why a user gesture
+    // was not required.  This includes the case where none is ever required.
+    GesturelessPlaybackUnknownReason = 20,
 
     // This enum value must be last.
     NumberOfAutoplayMetrics,
@@ -137,7 +160,7 @@ private:
     // Configure internal state to record that the autoplay experiment is
     // going to start playback.  This doesn't actually start playback, since
     // there are several different cases.
-    void prepareToPlay(AutoplayMetrics);
+    void prepareToAutoplay(AutoplayMetrics);
 
     // Process a timer for checking visibility.
     void viewportTimerFired(Timer<AutoplayExperimentHelper>*);