chrome/blink: Add functionality for in-product help for media elements.

third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h

Index: third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h
diff --git a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h
index c320b22b4edd2337ff8fb3d002cc04e5ba41213e..0fe33afc2c1eeeccf11e63041031e2d6549965ae 100644
--- a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h
@@ -120,6 +120,10 @@ class MODULES_EXPORT MediaControlsImpl final : public HTMLDivElement,
   void EndScrubbing();
   void UpdateCurrentTimeDisplay();
 
+  bool CanShow() const;

[mlamouri (slow - plz ping), 2017/07/25 17:29:08]

What does that mean?

[Khushal, 2017/08/03 02:41:21]

It returns the status of the panel. That is, whether the controls have been
hidden externally using Hide versus internal timer-based hiding. If its the
former, then we don't show the IPH. But if its the latter, then we can
internally make the controls visible for showing it.

+  bool IsVisible() const;
+  void StartHideMediaControlsIfNecessary();
+
   DECLARE_VIRTUAL_TRACE();
 
  private:
@@ -157,7 +161,6 @@ class MODULES_EXPORT MediaControlsImpl final : public HTMLDivElement,
 
   void MakeOpaque();
   void MakeTransparent();
-  bool IsVisible() const;
 
   void UpdatePlayState();