Don't show media controls when there is a persistent video.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index a88e34b8ef5da81a1023f346a20218e1bc04520b..5e5a641d725fb855cdd6e9d9ee6bb82ca383fb16 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -572,6 +572,7 @@ class CONTENT_EXPORT WebContentsImpl
   bool IsOverridingUserAgent() override;
   bool IsJavaScriptDialogShowing() const override;
   bool HideDownloadUI() const override;
+  bool HasPersistentVideo() const override;
 
   // NavigatorDelegate ---------------------------------------------------------
 
@@ -791,6 +792,9 @@ class CONTENT_EXPORT WebContentsImpl
   void IncrementBluetoothConnectedDeviceCount();
   void DecrementBluetoothConnectedDeviceCount();
 
+  // Called when the WebContents gains or loses a persistent video.
+  void SetHasPersistentVideo(bool value);
+
 #if defined(OS_ANDROID)
   // Called by FindRequestManager when all of the find match rects are in.
   void NotifyFindMatchRectsReply(int version,
@@ -1172,6 +1176,10 @@ class CONTENT_EXPORT WebContentsImpl
   // certificate via --allow-insecure-localhost.
   void ShowInsecureLocalhostWarningIfNeeded();
 
+  // Notify this WebContents that the preferences have changed. This will send
+  // an IPC to all the renderer process associated with this WebContents.
+  void NotifyPreferencesChanged();
+
   // Data for core operation ---------------------------------------------------
 
   // Delegate for notifying our owner about stuff. Not owned by us.
@@ -1498,6 +1506,8 @@ class CONTENT_EXPORT WebContentsImpl
 
   int currently_playing_video_count_ = 0;
 
+  bool has_persistent_video_ = false;
+
   base::WeakPtrFactory<WebContentsImpl> loading_weak_factory_;
   base::WeakPtrFactory<WebContentsImpl> weak_factory_;