Added prerendering to omnibox.

chrome/browser/instant/instant_controller.h

 // Copyright (c) 2011 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_INSTANT_INSTANT_CONTROLLER_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 175 matching lines @@
   virtual void CommitInstantLoader(InstantLoader* loader) OVERRIDE;
   virtual void InstantLoaderDoesntSupportInstant(
       InstantLoader* loader) OVERRIDE;
   virtual void AddToBlacklist(InstantLoader* loader,
                               const GURL& url) OVERRIDE;
   virtual void SwappedTabContents(InstantLoader* loader) OVERRIDE;
 
  private:
   friend class InstantTest;
 
+  enum PreviewCondition {
+    PREVIEW_CONDITION_SUCCESS,
+    PREVIEW_CONDITION_INVALID_TEMPLATE_URL,
+    PREVIEW_CONDITION_JAVASCRIPT_SCHEME,
+    PREVIEW_CONDITION_EXTENSION_KEYWORD,
+    PREVIEW_CONDITION_BLACKLISTED,
+    PREVIEW_CONDITION_INSTANT_SEARCH_ONLY,
+  };
+
   typedef std::set<std::string> HostBlacklist;
 
   // Updates |displayable_loader_| and if necessary notifies the delegate.
   void UpdateDisplayableLoader();
 
   // Returns the TabContents of the pending loader (or NULL). This is only used
   // for testing.
   TabContentsWrapper* GetPendingPreviewContents();
 
   // Returns true if we should update immediately.
@@ skipping 15 matching lines @@
 
   // Updates InstantLoaderManager and its current InstantLoader. This is invoked
   // internally from Update.
   void UpdateLoader(const TemplateURL* template_url,
                     const GURL& url,
                     PageTransition::Type transition_type,
                     const string16& user_text,
                     bool verbatim,
                     string16* suggested_text);
 
-  // Returns true if a preview should be shown for |match|. If |match| has
-  // a TemplateURL that supports the instant API it is set in |template_url|.
-  bool ShouldShowPreviewFor(const AutocompleteMatch& match,
-                            const TemplateURL** template_url);
+  // Returns a PreviewCondition indicating why we might decide not to show a
+  // preview for |match|. If |match| has a TemplateURL that supports the instant
+  // API it is set in |template_url|.
+  PreviewCondition GetPreviewConditionFor(const AutocompleteMatch& match,
+                                          const TemplateURL** template_url);
 
   // Marks the specified search engine id as not supporting instant.
   void BlacklistFromInstant(TemplateURLID id);
 
   // Returns true if the specified id has been blacklisted from supporting
   // instant.
   bool IsBlacklistedFromInstant(TemplateURLID id);
 
   // Clears the set of search engines blacklisted.
   void ClearBlacklist();
@@ skipping 56 matching lines @@
   ScopedVector<InstantLoader> loaders_to_destroy_;
 
   // The set of hosts that we don't use instant with. This is shared across all
   // instances and only maintained for the current session.
   static HostBlacklist* host_blacklist_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantController);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_