Add UMA for <webview> APIs: a. ClearData, b. when Permission request is allowed.

chrome/browser/guestview/webview/plugin_permission_helper.h

Index: chrome/browser/guestview/webview/plugin_permission_helper.h
diff --git a/chrome/browser/guestview/webview/plugin_permission_helper.h b/chrome/browser/guestview/webview/plugin_permission_helper.h
index 09f114ed5ec078a6e6bb8aefe51193932c2861d5..b60cee1694a0423fe548c8deb7f412665b175059 100644
--- a/chrome/browser/guestview/webview/plugin_permission_helper.h
+++ b/chrome/browser/guestview/webview/plugin_permission_helper.h
@@ -38,7 +38,8 @@ class PluginPermissionHelper
 
   void OnPermissionResponse(const std::string& identifier,
                             bool allow,
-                            const std::string& user_input);
+                            const std::string& user_input,
+                            bool user_initiated);
 
   base::WeakPtrFactory<PluginPermissionHelper> weak_factory_;