Create feature and enable data collection for Data Saver site breakdown

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 26708054ff4f71c3aeab32d03aa312b39294a535..f21a8e39f85d50e45ff56d411887d3deeefb8d57 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -1176,6 +1176,12 @@ const char kEnableDataReductionProxyMainMenuDescription[] =
     "Enables the Data Saver menu item in the main menu rather than under "
     "Settings.";
 
+const char kEnableDataReductionProxySiteBreakdownName[] =
+    "Data Saver Site Breakdown";
+
+const char kEnableDataReductionProxySiteBreakdownDescription[] =
+    "Enable the site breakdown on the Data Saver settings page.";
+
 #endif  // defined(OS_ANDROID)
 
 const char kLcdTextName[] = "LCD text antialiasing";