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

third_party/WebKit/Source/core/dom/Document.h

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index efed3a47b4124b6a0680279b24e1ce6aeb06eabc..fd2af4b3bef717a34bdae1f7a30c3e27e23edb74 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -133,6 +133,7 @@ class Locale;
 class LocalFrame;
 class LocalFrameView;
 class Location;
+class MediaIPHManager;
 class MediaQueryListListener;
 class MediaQueryMatcher;
 class NodeIterator;
@@ -1324,6 +1325,8 @@ class CORE_EXPORT Document : public ContainerNode,
 
   void SetFeaturePolicy(const String& feature_policy_header);
 
+  MediaIPHManager* GetMediaIPHManager();
+
  protected:
   Document(const DocumentInit&, DocumentClassFlags = kDefaultDocumentClass);
 
@@ -1686,6 +1689,8 @@ class CORE_EXPORT Document : public ContainerNode,
   mojom::EngagementLevel engagement_level_;
 
   Member<NetworkStateObserver> network_state_observer_;
+
+  Member<MediaIPHManager> media_iph_manager_;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Document>;