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 72e4b50cdbd0727418fbd6913c29e6bbc2e57e2c..f718f391669cf8792e644cb6eac3c6a03d527bfc 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -564,6 +564,7 @@ class CONTENT_EXPORT WebContentsImpl
   bool IsOverridingUserAgent() override;
   bool IsJavaScriptDialogShowing() const override;
   bool HideDownloadUI() const override;
+  bool HasPersistentVideo() const override;
 
   // NavigatorDelegate ---------------------------------------------------------
 
@@ -793,6 +794,9 @@ 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,
@@ -1174,6 +1178,10 @@ class CONTENT_EXPORT WebContentsImpl
   // certificate via --allow-insecure-localhost.
   void ShowInsecureLocalhostWarningIfNeeded();
 
+  // Notify the RenderViewHost that the preferences have changed. This will send

[nasko, 2017/02/13 22:28:42]

Let's avoid using RenderViewHost, as it is currently an implementation detail
and that will change soon. It should be semantically the same comment if we do
s/RenderViewHost/this WebContents/.

[mlamouri (slow - plz ping), 2017/02/14 11:19:46]

Done.

+  // 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.
@@ -1500,6 +1508,8 @@ 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_;