Implement SearchTabHelperDelegate.

chrome/browser/ui/search/search_tab_helper_delegate.h

+// Copyright 2014 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_DELEGATE_H_
+#define CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_DELEGATE_H_
+
+#include <set>
+#include <string>
+
+#include "ui/base/window_open_disposition.h"
+
+namespace content {
+class WebContents;
+}
+
+class GURL;
+class OmniboxView;
+
+// Objects implement this interface to get notified about changes in the
+// SearchTabHelper and to provide necessary functionality.
+class SearchTabHelperDelegate {
+ public:
+  // Navigates the page to |url| in response to a click event. Usually used
+  // by the page to navigate to privileged destinations (e.g. chrome:// URLs) or
+  // to navigate to URLs that are hidden from the page using Restricted IDs
+  // (rid in the API).
+  //
+  // TODO(kmadhusu): Handle search results page navigations to privileged
+  // destinations in a seperate function. This function should handle only the
+  // new tab page thumbnail click events.
+  virtual void NavigateOnThumbnailClick(const GURL& url,
+                                        WindowOpenDisposition disposition,
+                                        content::WebContents* source_contents);
+
+  // Invoked when the |web_contents| no longer supports Instant.
+  virtual void OnWebContentsInstantSupportDisabled(
+      const content::WebContents* web_contents);
+
+  // Returns the OmniboxView or NULL if not available.
+  virtual OmniboxView* GetOmniboxView();
+
+  // Returns a set containing the canonical URLs of the currently open tabs.
+  virtual std::set<std::string> GetOpenUrls();
+
+ protected:
+  virtual ~SearchTabHelperDelegate();
+};
+
+#endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_DELEGATE_H_