Create feature and enable data collection for Data Saver site breakdown

chrome/browser/flag_descriptions.h

 // Copyright 2017 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_FLAG_DESCRIPTIONS_H_
 #define CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 
 // Includes needed for macros allowing conditional compilation of some strings.
 #include "build/build_config.h"
 #include "build/buildflag.h"
@@ skipping 1276 matching lines @@
 #if defined(OS_ANDROID)
 
 // An about:flags experiment title to enable the Data Saver menu item in the
 // main menu rather than under settings on Android
 extern const char kEnableDataReductionProxyMainMenuName[];
 
 // Describes an about:flags experiment to enable the Data Saver menu item in the
 // main menu rather than under settings on Android
 extern const char kEnableDataReductionProxyMainMenuDescription[];
 
+// An about:flags experiment title to enable the site breakdown on the Data
+// Saver settings page.
+extern const char kEnableDataReductionProxySiteBreakdownName[];
+
+// Describes an about:flags experiment to enable the site breakdown on the Data
+// Saver settings page.
+extern const char kEnableDataReductionProxySiteBreakdownDescription[];
+
 #endif  // defined(OS_ANDROID)
 
 // Name of about:flags option for LCD text.
 extern const char kLcdTextName[];
 
 // Description of about:flags option for LCD text.
 extern const char kLcdTextDescription[];
 
 // Name of about:flags option for distance field text.
 extern const char kDistanceFieldTextName[];
@@ skipping 1845 matching lines @@
 
 // Description of the about: flag enabling emoji, handwriting and voice input on
 // opt-in IME menu.
 extern const char kEnableEhvInputDescription[];
 
 #endif  // #if defined(OS_CHROMEOS)
 
 }  // namespace flag_descriptions
 
 #endif  // CHROME_BROWSER_FLAG_DESCRIPTIONS_H_