Adds support for showing the match preview on views. It's behind the

chrome/browser/tab_contents/tab_contents.h

 // Copyright (c) 2010 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_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 50 matching lines @@
 
 class AutocompleteHistoryManager;
 class AutoFillManager;
 class BlockedPluginManager;
 class BlockedPopupContainer;
 class DOMUI;
 class DownloadItem;
 class Extension;
 class InfoBarDelegate;
 class LoadNotificationDetails;
+class MatchPreview;
 class OmniboxSearchHint;
 class PasswordManager;
 class PluginInstaller;
 class Profile;
 struct RendererPreferences;
 class RenderViewHost;
 class SiteInstance;
 class SkBitmap;
 class TabContents;
 class TabContentsDelegate;
@@ skipping 72 matching lines @@
 
   // Returns the PasswordManager, creating it if necessary.
   PasswordManager* GetPasswordManager();
 
   // Returns the PluginInstaller, creating it if necessary.
   PluginInstaller* GetPluginInstaller();
 
   // Returns the TabContentsSSLHelper, creating if it necessary.
   TabContentsSSLHelper* GetSSLHelper();
 
+  // Returns the MatchPreview. Returns NULL if MatchPreview is not enabled.
+  MatchPreview* match_preview() { return match_preview_.get(); }
+
   // Returns the SavePackage which manages the page saving job. May be NULL.
   SavePackage* save_package() const { return save_package_.get(); }
 
   // Return the currently active RenderProcessHost and RenderViewHost. Each of
   // these may change over time.
   RenderProcessHost* GetRenderProcessHost() const;
   RenderViewHost* render_view_host() const {
     return render_manager_.current_host();
   }
   // Returns the currently active RenderWidgetHostView. This may change over
@@ skipping 1081 matching lines @@
 
   // Information about the language the page is in and has been translated to.
   LanguageState language_state_;
 
   // See description above setter.
   bool closed_by_user_gesture_;
 
   // See description in RenderViewHostDelegate::SetDisplayingPDFContent.
   bool displaying_pdf_content_;
 
+  scoped_ptr<MatchPreview> match_preview_;
+
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_