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 c8bba03406999ebcf2a926da86f0cb5d7b5ef120..3794c52b1e3b437d99ef32c6598f9e0767ef4aa9 100644
--- a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h
@@ -98,6 +98,8 @@ class MODULES_EXPORT MediaControlsImpl final : public HTMLDivElement,
     // There is no update because only the overlay is expected to change.
     RefreshCastButtonVisibilityWithoutUpdate();
   }
+  bool GetDownloadButtonRect(IntRect&) override;
+  void InProductHelpDisabled() override;
   Document& OwnerDocument() { return GetDocument(); }
 
   // Called by the fullscreen buttons to toggle fulllscreen on/off.
@@ -120,6 +122,8 @@ class MODULES_EXPORT MediaControlsImpl final : public HTMLDivElement,
   void EndScrubbing();
   void UpdateCurrentTimeDisplay();
 
+  void MaybeDispatchDownloadIPHTrigger();
+
   DECLARE_VIRTUAL_TRACE();
 
  private: