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

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 989fd178d0a606a43cda0b8b0c7c7f605c43ecfc..4155fb7620628ebdd759d8da79a593f47def1115 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -41,6 +41,7 @@ class WebFrame;
 class WebLocalFrame;
 class WebMIDIAccessor;
 class WebMIDIAccessorClient;
+class WebMediaIPH;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 class WebPlugin;
@@ -370,6 +371,9 @@ class CONTENT_EXPORT ContentRendererClient {
 
   // Returns true if the media pipeline can be suspended, or false otherwise.
   virtual bool AllowMediaSuspend();
+
+  virtual std::unique_ptr<blink::WebMediaIPH> CreateWebMediaIPH(
+      content::RenderFrame* render_frame);
 };
 
 }  // namespace content