Move instant support to SearchTabHelper.

chrome/browser/ui/search/search_tab_helper.h

 // Copyright 2012 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_UI_SEARCH_SEARCH_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
 #include "chrome/browser/ui/search/search_model.h"
 #include "chrome/common/instant_types.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"
 
 namespace content {
 class WebContents;
 }
 
+class InstantPageTest;
+
 // Per-tab search "helper".  Acts as the owner and controller of the tab's
 // search UI model.

[samarth, 2013/06/19 05:25:02]

I think this could a top-level comment of how instant support is tracked.  In
particular, how each new naventry (except for in-page navigations) reset support
to UNKNOWN and cause support to be determined again.

[kmadhusu, 2013/06/19 16:28:15]

Done.

 class SearchTabHelper : public content::NotificationObserver,
                         public content::WebContentsObserver,
                         public content::WebContentsUserData<SearchTabHelper> {
  public:
   virtual ~SearchTabHelper();
 
   SearchModel* model() {
     return &model_;
   }
 
   // Invoked when the OmniboxEditModel changes state in some way that might
   // affect the search mode.
   void OmniboxEditModelChanged(bool user_input_in_progress,
                                bool cancelling,
                                bool popup_is_open,
                                bool user_text_is_empty);
 
   // Invoked when the active navigation entry is updated in some way that might
   // affect the search mode. This is used by Instant when it "fixes up" the
   // virtual URL of the active entry. Regular navigations are captured through
   // the notification system and shouldn't call this method.
   void NavigationEntryUpdated();
 
   // Updates |last_known_most_visited_items_| with |items|.
   // Returns false if |items| matches the |last_known_most_visited_items_|.
   bool UpdateLastKnownMostVisitedItems(
       const std::vector<InstantMostVisitedItem>& items);
 
+  // Invoked to update the instant support state.
+  void InstantSupportChanged(bool supports_instant);
+
+  // Returns true if the page supports instant. If the instant support state is
+  // not determined or if the page does not support instant returns false.
+  bool SupportsInstant() const;
+
  private:
   friend class content::WebContentsUserData<SearchTabHelper>;
+  friend class InstantPageTest;
+  FRIEND_TEST_ALL_PREFIXES(InstantPageTest,
+                           DetermineIfPageSupportsInstant_Local);
+  FRIEND_TEST_ALL_PREFIXES(InstantPageTest,
+                           DetermineIfPageSupportsInstant_NonLocal);
+  FRIEND_TEST_ALL_PREFIXES(InstantPageTest,
+                           PageURLDoesntBelongToInstantRenderer);
+  FRIEND_TEST_ALL_PREFIXES(InstantPageTest, PageSupportsInstant);
 
   explicit SearchTabHelper(content::WebContents* web_contents);
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Overridden from contents::WebContentsObserver:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void DidFinishLoad(
+      int64 frame_id,
+      const GURL& validated_url,
+      bool is_main_frame,
+      content::RenderViewHost* render_view_host) OVERRIDE;
 
   // Sets the mode of the model based on the current URL of web_contents().
   void UpdateMode();
 
+  // Tells the renderer to determine if the page supports the Instant API, which
+  // results in a call to OnInstantSupportDetermined() when the reply
+  // is received.
+  void DetermineIfPageSupportsInstant();
+
+  // Handler for when Instant support has been determined.
+  void OnInstantSupportDetermined(int page_id, bool supports_instant);
+
   // Handlers for SearchBox API to show and hide top bars (bookmark and info
   // bars).
   void OnSearchBoxShowBars(int page_id);
   void OnSearchBoxHideBars(int page_id);
 
   const bool is_search_enabled_;
 
   // Tracks the last value passed to OmniboxEditModelChanged().
   bool user_input_in_progress_;
   bool popup_is_open_;
   bool user_text_is_empty_;
 
   // Model object for UI that cares about search state.
   SearchModel model_;
 
   content::NotificationRegistrar registrar_;
 
   content::WebContents* web_contents_;
 
   // Tracks the last set of most visited items sent to the InstantPage renderer.
   // Used to prevent sending duplicate IPC messages to the renderer.
   std::vector<InstantMostVisitedItem> last_known_most_visited_items_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_