Add extension event histogram values for messaging, webRequest, and webview.

extensions/browser/api/web_request/web_request_api.h

Index: extensions/browser/api/web_request/web_request_api.h
diff --git a/extensions/browser/api/web_request/web_request_api.h b/extensions/browser/api/web_request/web_request_api.h
index 49bed01b9de2d19c0439e3c446e44c956228f0bb..06ffbff03dcc927f181e5e4ba65f02960731822e 100644
--- a/extensions/browser/api/web_request/web_request_api.h
+++ b/extensions/browser/api/web_request/web_request_api.h
@@ -271,17 +271,17 @@ class ExtensionWebRequestEventRouter
   // listened to. |sub_event_name| is an internal event uniquely generated in
   // the extension process to correspond to the given filter and
   // extra_info_spec. It returns true on success, false on failure.
-  bool AddEventListener(
-      void* browser_context,
-      const std::string& extension_id,
-      const std::string& extension_name,
-      const std::string& event_name,
-      const std::string& sub_event_name,
-      const RequestFilter& filter,
-      int extra_info_spec,
-      int embedder_process_id,
-      int web_view_instance_id,
-      base::WeakPtr<IPC::Sender> ipc_sender);
+  bool AddEventListener(void* browser_context,
+                        const std::string& extension_id,
+                        const std::string& extension_name,
+                        events::HistogramValue histogram_value,
+                        const std::string& event_name,
+                        const std::string& sub_event_name,
+                        const RequestFilter& filter,
+                        int extra_info_spec,
+                        int embedder_process_id,
+                        int web_view_instance_id,
+                        base::WeakPtr<IPC::Sender> ipc_sender);
 
   // Removes the listener for the given sub-event.
   void RemoveEventListener(