Plumb site engagement to the renderer process.

chrome/browser/engagement/site_engagement_helper.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_HELPER_H_
 #define CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_HELPER_H_
 
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/engagement/site_engagement_metrics.h"
 #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
 // origins.
 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.
   //
   // Engagement detection begins at some constant time delta following
   // navigation, tab activation, or media starting to play. Once engagement is
   // recorded, detection is suspended for another constant time delta. For sites
   // to continually record engagement, this overall design requires:
   //
   // 1. engagement at a non-trivial time after a site loads
   // 2. continual engagement over a non-trivial duration of time
@@ skipping 111 matching lines @@
   friend class SiteEngagementHelperTest;
 
   // Ask the SiteEngagementService to record engagement via user input at the
   // current WebContents URL.
   void RecordUserInput(SiteEngagementMetrics::EngagementType type);
 
   // Ask the SiteEngagementService to record engagement via media playing at the
   // 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;
 
   InputTracker input_tracker_;
   MediaTracker media_tracker_;
   SiteEngagementService* service_;
 
   DISALLOW_COPY_AND_ASSIGN(Helper);
 };
 
 #endif  // CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_HELPER_H_