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..c9d0a2473e610cda25cb853598a9126f01edf07e 100644
--- a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.h
@@ -30,6 +30,7 @@
 #include "core/html/HTMLDivElement.h"
 #include "core/html/media/MediaControls.h"
 #include "modules/ModulesExport.h"
+#include "public/platform/media_in_product_help.mojom-blink.h"
 
 namespace blink {
 
@@ -120,6 +121,8 @@ class MODULES_EXPORT MediaControlsImpl final : public HTMLDivElement,
   void EndScrubbing();
   void UpdateCurrentTimeDisplay();
 
+  void MaybeDispatchDownloadIPHTrigger();
+
   DECLARE_VIRTUAL_TRACE();
 
  private:
@@ -212,6 +215,9 @@ class MODULES_EXPORT MediaControlsImpl final : public HTMLDivElement,
   void OnPanelKeypress();
   void OnMediaKeyboardEvent(Event* event) { DefaultEventHandler(event); }
 
+  void UpdateDownloadInProductHelpState();
+  void DismissDownloadInProductHelp();
+
   // Media control elements.
   Member<MediaControlOverlayEnclosureElement> overlay_enclosure_;
   Member<MediaControlOverlayPlayButtonElement> overlay_play_button_;
@@ -257,6 +263,9 @@ class MODULES_EXPORT MediaControlsImpl final : public HTMLDivElement,
   IntSize size_;
 
   bool keep_showing_until_timer_fires_ : 1;
+
+  std::unique_ptr<mojom::blink::MediaInProductHelpPtr> media_in_product_help_;
+  bool media_download_in_product_trigger_observed_ = false;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControlsImpl, IsMediaControls());