Propogate the tab foreground, background change events to data use

chrome/browser/data_use_measurement/data_use_web_contents_observer.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/data_use_measurement/data_use_web_contents_observer.h"
 
 #include "chrome/browser/data_use_measurement/chrome_data_use_ascriber_service.h"
 #include "chrome/browser/data_use_measurement/chrome_data_use_ascriber_service_factory.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 54 matching lines @@
 void DataUseWebContentsObserver::DidStartNavigation(
     content::NavigationHandle* navigation_handle) {
   service_->DidStartNavigation(navigation_handle);
 }
 
 void DataUseWebContentsObserver::ReadyToCommitNavigation(
     content::NavigationHandle* navigation_handle) {
   service_->ReadyToCommitNavigation(navigation_handle);
 }
 
+void DataUseWebContentsObserver::WasShown() {
+  service_->WasShownOrHidden(web_contents()->GetMainFrame(), true);
+}
+
+void DataUseWebContentsObserver::WasHidden() {
+  service_->WasShownOrHidden(web_contents()->GetMainFrame(), false);
+}
+
+void DataUseWebContentsObserver::RenderFrameHostChanged(
+    content::RenderFrameHost* old_host,
+    content::RenderFrameHost* new_host) {
+  service_->RenderFrameHostChanged(old_host, new_host);
+}
+
 }  // namespace data_use_measurement