Adds keyboard functionality for videos.

third_party/WebKit/Source/core/html/shadow/MediaControls.h

Index: third_party/WebKit/Source/core/html/shadow/MediaControls.h
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControls.h b/third_party/WebKit/Source/core/html/shadow/MediaControls.h
index b2046b6cbf97cd441b9544e5aaa4bb1c7126c58c..b20d0f0b4343ac40db589927369634a9c376199f 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControls.h
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControls.h
@@ -116,6 +116,7 @@ class CORE_EXPORT MediaControls final : public HTMLDivElement {
   friend class MediaControlsMediaEventListener;
   friend class MediaControlsOrientationLockDelegateTest;
   friend class MediaControlsTest;
+  friend class HTMLMediaElement;

[mlamouri (slow - plz ping), 2017/02/16 17:13:54]

We have an ongoing project to split the close relationship between MediaControls
and HTMLMediaElement. I don't think we should add friends here :) MediaControls
should only access public methods from HTMLMediaElement. Ideally, only methods
available from HTMLMediaElement.idl.

[CJ, 2017/02/17 02:45:50]

I figured, I just wanted to start the conversation. It was either this or making
the startHideMediaControlsTimer() public (it is the only reason for friends
here). Would making startHideMediaControlsTimer() public be better? I did not
find a good public method that would reach into this functionality. I am open to
other suggestions though.

 
   void invalidate(Element*);