Plumb site engagement to the renderer process.

chrome/browser/engagement/site_engagement_helper.h

Index: chrome/browser/engagement/site_engagement_helper.h
diff --git a/chrome/browser/engagement/site_engagement_helper.h b/chrome/browser/engagement/site_engagement_helper.h
index 134f5f00de6dfa8a46fd91134a99eaf7a61548b3..7cc37c2d8b48a2fe862d634a8d3af4026bb4d23a 100644
--- a/chrome/browser/engagement/site_engagement_helper.h
+++ b/chrome/browser/engagement/site_engagement_helper.h
@@ -11,10 +11,10 @@
 #include "chrome/browser/engagement/site_engagement_service.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
+#include "third_party/WebKit/public/platform/site_engagement.mojom.h"
 
 namespace content {
 class NavigationHandle;
-class WebContents;
 }
 
 // Per-WebContents class to handle updating the site engagement scores for
@@ -23,12 +23,15 @@ class SiteEngagementService::Helper
     : public content::WebContentsObserver,
       public content::WebContentsUserData<SiteEngagementService::Helper> {
  public:
-  ~Helper() override;
-
   static void SetSecondsBetweenUserInputCheck(int seconds);
   static void SetSecondsTrackingDelayAfterNavigation(int seconds);
   static void SetSecondsTrackingDelayAfterShow(int seconds);
 
+  ~Helper() override;
+
+  void OnEngagementLevelChanged(const GURL& origin,
+                                blink::mojom::EngagementLevel level);
+
  private:
   // Class to encapsulate the periodic detection of site engagement.
   //
@@ -160,8 +163,16 @@ class SiteEngagementService::Helper
   // current WebContents URL.
   void RecordMediaPlaying(bool is_hidden);
 
+  void SendEngagementLevelToFramesMatchingOrigin(
+      const GURL& origin,
+      blink::mojom::EngagementLevel level,
+      content::RenderFrameHost* render_frame_host);
+  void SendEngagementLevelToFrame(blink::mojom::EngagementLevel level,
+                                  content::RenderFrameHost* render_frame_host);
+
   // content::WebContentsObserver overrides.
   void DidFinishNavigation(content::NavigationHandle* handle) override;
+  void ReadyToCommitNavigation(content::NavigationHandle* handle) override;
   void WasShown() override;
   void WasHidden() override;