Add UMA to count the number of Google CAPTCHA pages shown and solved by users.

components/page_load_metrics/browser/metrics_web_contents_observer.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 COMPONENTS_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_WEB_CONTENTS_OBSERVER_H_
 #define COMPONENTS_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/containers/scoped_ptr_map.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
@@ skipping 15 matching lines @@
 namespace IPC {
 class Message;
 }  // namespace IPC
 
 namespace rappor {
 class RapporService;
 }
 
 namespace page_load_metrics {
 
+// Returns true if the given URL matches a Google CAPTCHA page.
+bool IsGoogleCaptcha(const GURL& url);
+
 // These constants are for keeping the tests in sync.
 const char kHistogramNameFirstLayout[] =
     "PageLoad.Timing2.NavigationToFirstLayout";
 const char kHistogramNameFirstTextPaint[] =
     "PageLoad.Timing2.NavigationToFirstTextPaint";
 const char kHistogramNameDomContent[] =
     "PageLoad.Timing2.NavigationToDOMContentLoadedEventFired";
 const char kHistogramNameLoad[] = "PageLoad.Timing2.NavigationToLoadEventFired";
 const char kBGHistogramNameFirstLayout[] =
     "PageLoad.Timing2.NavigationToFirstLayout.Background";
@@ skipping 186 matching lines @@
   void AddObserver(PageLoadMetricsObserver* observer) override;
   void RemoveObserver(PageLoadMetricsObserver* observer) override;
 
   // content::WebContentsObserver implementation:
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* render_frame_host) override;
   void DidStartNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidFinishNavigation(
       content::NavigationHandle* navigation_handle) override;
+  void DidRedirectNavigation(
+      content::NavigationHandle* navigation_handle) override;
 
   void WasShown() override;
   void WasHidden() override;
 
   void RenderProcessGone(base::TerminationStatus status) override;
 
  private:
   friend class content::WebContentsUserData<MetricsWebContentsObserver>;
 
   void OnTimingUpdated(content::RenderFrameHost*, const PageLoadTiming& timing);
@@ skipping 11 matching lines @@
 
   rappor::RapporService* const rappor_service_;
   base::ObserverList<PageLoadMetricsObserver, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsWebContentsObserver);
 };
 
 }  // namespace page_load_metrics
 
 #endif  // COMPONENTS_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_WEB_CONTENTS_OBSERVER_H_