Record InstantExtended pref setting on startup with an UMA histogram.

chrome/browser/ui/search/search.h

 // Copyright (c) 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_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 55 matching lines @@
 // Returns search terms if this WebContents is a search results page. It looks
 // in the visible NavigationEntry first, to see if search terms have already
 // been extracted. Failing that, it tries to extract search terms from the URL.
 // Returns a blank string if search terms were not found, or if search terms
 // extraction is disabled for this WebContents or profile.
 string16 GetSearchTerms(const content::WebContents* contents);
 
 // Returns true if |url| should be rendered in the Instant renderer process.
 bool ShouldAssignURLToInstantRenderer(const GURL& url, Profile* profile);
 
+// Record the InstantExtended pref value for UMA.
+void RecordInstantExtendedPrefValue(bool pref_value);
+
 // -----------------------------------------------------
 // The following APIs are exposed for use in tests only.
 // -----------------------------------------------------
 
 // Forces the Instant Extended API to be enabled for tests.
 void EnableInstantExtendedAPIForTesting();
 
 // Forces query extraction to be enabled for tests.
 void EnableQueryExtractionForTesting();
 
@@ skipping 39 matching lines @@
 
 // Coerces the commandline Instant URL to look like a template URL, so that we
 // can extract search terms from it.
 GURL CoerceCommandLineURLToTemplateURL(const GURL& instant_url,
                                        const TemplateURLRef& ref);
 
 }  // namespace search
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_H_