When autoplay of muted videos is disabled, record the reason why.

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

 // 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.
 
 #include "core/html/AutoplayUmaHelper.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ElementVisibilityObserver.h"
 #include "core/events/Event.h"
 #include "core/frame/LocalDOMWindow.h"
+#include "core/frame/Settings.h"
 #include "core/html/HTMLMediaElement.h"
 #include "platform/Histogram.h"
 
 namespace blink {
 
 namespace {
 
 void recordVideoAutoplayMutedPlayMethodBecomesVisibleUma(bool visible)
 {
     DEFINE_STATIC_LOCAL(BooleanHistogram, histogram, ("Media.Video.Autoplay.Muted.PlayMethod.BecomesVisible"));
@@ skipping 18 matching lines @@
 bool AutoplayUmaHelper::operator==(const EventListener& other) const
 {
     return this == &other;
 }
 
 void AutoplayUmaHelper::onAutoplayInitiated(AutoplaySource source)
 {
     DEFINE_STATIC_LOCAL(EnumerationHistogram, videoHistogram, ("Media.Video.Autoplay", static_cast<int>(AutoplaySource::NumberOfSources)));
     DEFINE_STATIC_LOCAL(EnumerationHistogram, mutedVideoHistogram, ("Media.Video.Autoplay.Muted", static_cast<int>(AutoplaySource::NumberOfSources)));
     DEFINE_STATIC_LOCAL(EnumerationHistogram, audioHistogram, ("Media.Audio.Autoplay", static_cast<int>(AutoplaySource::NumberOfSources)));
+    DEFINE_STATIC_LOCAL(EnumerationHistogram, blockedMutedVideoHistogram, ("Media.Video.Autoplay.Muted.Blocked", AutoplayBlockedReasonMax));
 
     m_source = source;
 
+    // Record the source.
     if (m_element->isHTMLVideoElement()) {
         videoHistogram.count(static_cast<int>(m_source));
         if (m_element->muted())
             mutedVideoHistogram.count(static_cast<int>(m_source));
     } else {
         audioHistogram.count(static_cast<int>(m_source));
     }
 
+    // Record if it will be blocked by Data Saver or Autoplay setting.
+    if (m_element->isHTMLVideoElement() && m_element->muted() && RuntimeEnabledFeatures::autoplayMutedVideosEnabled()) {
+        bool dataSaverEnabled = m_element->document().settings() && m_element->document().settings()->dataSaverEnabled();
+        bool blockedBySetting = !m_element->isAutoplayAllowedPerSettings();
+
+        if (dataSaverEnabled && blockedBySetting) {
+            blockedMutedVideoHistogram.count(AutoplayBlockedReasonDataSaverAndSetting);

[Zhiqiang Zhang (Slow), 2016/08/24 16:50:47]

Autoplay is gray when DataSaver is on, might not be very useful?

[mlamouri (slow - plz ping), 2016/08/24 21:39:24]

It's really in the spirit of not leaking chrome/ behaviour into Blink and not
making assumptions. If a user has disabled autoplay then toggle Data Saver, the
order in which we record would matter.

+        } else if (dataSaverEnabled) {
+            blockedMutedVideoHistogram.count(AutoplayBlockedReasonDataSaver);
+        } else if (blockedBySetting) {
+            blockedMutedVideoHistogram.count(AutoplayBlockedReasonSetting);
+        }
+    }
+
     if (m_source == AutoplaySource::Method && m_element->isHTMLVideoElement() && m_element->muted())
         m_element->addEventListener(EventTypeNames::playing, this, false);
 }
 
 void AutoplayUmaHelper::recordAutoplayUnmuteStatus(AutoplayUnmuteActionStatus status)
 {
     DEFINE_STATIC_LOCAL(EnumerationHistogram, autoplayUnmuteHistogram, ("Media.Video.Autoplay.Muted.UnmuteAction", static_cast<int>(AutoplayUnmuteActionStatus::NumberOfStatus)));
 
     autoplayUnmuteHistogram.count(static_cast<int>(status));
 }
@@ skipping 56 matching lines @@
 }
 
 DEFINE_TRACE(AutoplayUmaHelper)
 {
     EventListener::trace(visitor);
     visitor->trace(m_element);
     visitor->trace(m_videoMutedPlayMethodVisibilityObserver);
 }
 
 } // namespace blink