Show interstitial from ManagedModeNavigationObserver instead of ManagedModeResourceThrottle.

chrome/browser/managed_mode/managed_mode_navigation_observer.h

Index: chrome/browser/managed_mode/managed_mode_navigation_observer.h
diff --git a/chrome/browser/managed_mode/managed_mode_navigation_observer.h b/chrome/browser/managed_mode/managed_mode_navigation_observer.h
index 1ddd4953e9a79fb2549b6c5dd43ccf931b6df305..044f1243e0c877977135eff3f8ffa4138b1e84d2 100644
--- a/chrome/browser/managed_mode/managed_mode_navigation_observer.h
+++ b/chrome/browser/managed_mode/managed_mode_navigation_observer.h
@@ -7,7 +7,10 @@
 
 #include <set>
 
+#include "base/memory/weak_ptr.h"
 #include "base/values.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
@@ -16,18 +19,26 @@ class ManagedModeURLFilter;
 class ManagedUserService;
 
 class ManagedModeNavigationObserver
-    : public content::WebContentsObserver,
-      public content::WebContentsUserData<ManagedModeNavigationObserver> {
+    : public content::WebContentsUserData<ManagedModeNavigationObserver>,
+      public content::WebContentsObserver,
+      public content::NotificationObserver {
  public:
+  typedef base::Callback<void(bool)> SuccessCallback;
+
   virtual ~ManagedModeNavigationObserver();
 
+  // Called when a network request was blocked. The passed in |callback| is
+  // called with the result of the interstitial, i.e. whether we should proceed
+  // with the request or not.
+  static void DidBlockRequest(int render_process_id,
+                              int render_view_id,
+                              const GURL& url,
+                              const SuccessCallback& callback);
+
   // Sets the specific infobar as dismissed.
   void WarnInfobarDismissed();
   void PreviewInfobarDismissed();
 
-  // Sets the state of the Observer from the outside.
-  void SetStateToRecordingAfterPreview();
-
   // Returns whether the user should be allowed to navigate to this URL after
   // he has clicked "Preview" on the interstitial.
   bool CanTemporarilyNavigateHost(const GURL& url);
@@ -65,6 +76,16 @@ class ManagedModeNavigationObserver
 
   explicit ManagedModeNavigationObserver(content::WebContents* web_contents);
 
+  // Shows the blocking interstitial if it is not already shown.
+  void ShowInterstitial(const GURL& url);
+
+  // Queues up a callback to be called with the result of the interstitial.
+  void AddInterstitialCallback(const GURL& url,
+                               const SuccessCallback& callback);
+
+  // Dispatches the result of the interstitial to all pending callbacks.
+  void OnInterstitialResult(bool result);
+
   // Adding the temporary exception stops the ResourceThrottle from showing
   // an interstitial for this RenderView. This allows the user to navigate
   // around on the website after clicking preview.
@@ -75,6 +96,10 @@ class ManagedModeNavigationObserver
 
   void AddURLToPatternList(const GURL& url);
 
+  // Returns whether the user would stay in elevated state if he visits this
+  // URL.
+  bool ShouldStayElevatedForURL(const GURL& url);
+
   // content::WebContentsObserver implementation.
   // An example regarding the order in which these events take place for
   // google.com in our case is as follows:
@@ -90,9 +115,6 @@ class ManagedModeNavigationObserver
   virtual void NavigateToPendingEntry(
       const GURL& url,
       content::NavigationController::ReloadType reload_type) OVERRIDE;
-  virtual void DidNavigateMainFrame(
-      const content::LoadCommittedDetails& details,
-      const content::FrameNavigateParams& params) OVERRIDE;
   virtual void ProvisionalChangeToMainFrameUrl(
       const GURL& url,
       content::RenderViewHost* render_view_host) OVERRIDE;
@@ -102,11 +124,15 @@ class ManagedModeNavigationObserver
       const GURL& url,
       content::PageTransition transition_type,
       content::RenderViewHost* render_view_host) OVERRIDE;
+  virtual void DidNavigateMainFrame(
+      const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) OVERRIDE;
   virtual void DidGetUserGesture() OVERRIDE;
 
-  // Returns whether the user would stay in elevated state if he visits this
-  // URL.
-  bool ShouldStayElevatedForURL(const GURL& url);
+  // content::NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
 
   // Owned by the profile, so outlives us.
   ManagedUserService* managed_user_service_;
@@ -132,6 +158,15 @@ class ManagedModeNavigationObserver
   // Will be set to true for non-managed users.
   bool is_elevated_;
 
+  base::WeakPtrFactory<ManagedModeNavigationObserver> weak_ptr_factory_;
+
+  // These callbacks get queued up when we show the blocking interstitial and
+  // are posted to the IO thread with the result of the interstitial, i.e.
+  // whether the user successfully authenticated to continue.
+  std::vector<SuccessCallback> callbacks_;
+
+  content::NotificationRegistrar registrar_;
+
   int last_allowed_page_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagedModeNavigationObserver);