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

content/browser/browser_plugin/browser_plugin_guest.cc

 // 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.
 
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 
 #include <algorithm>
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
@@ skipping 418 matching lines @@
   }
 
   int request_id = ++next_permission_request_id_;
   permission_request_map_[request_id] = request;
 
   BrowserPluginGuestDelegate::PermissionResponseCallback callback =
       base::Bind(&BrowserPluginGuest::RespondToPermissionRequest,
                   AsWeakPtr(),
                   request_id);
   // If BrowserPluginGuestDelegate hasn't handled the permission then we simply
-  // reject it immediately.
+  // perform the default action (which is one of allow or reject) immediately.
   if (!delegate_->RequestPermission(
       permission_type, request_info, callback, request->AllowedByDefault())) {
     callback.Run(request->AllowedByDefault(), "");
     return browser_plugin::kInvalidPermissionRequestID;
   }
 
   return request_id;
 }
 
 BrowserPluginGuest* BrowserPluginGuest::CreateNewGuestWindow(
@@ skipping 1281 matching lines @@
   request_info.Set(browser_plugin::kRequestMethod,
                    base::Value::CreateStringValue(request_method));
   request_info.Set(browser_plugin::kURL, base::Value::CreateStringValue(url));
 
   RequestPermission(BROWSER_PLUGIN_PERMISSION_TYPE_DOWNLOAD,
                     new DownloadRequest(callback),
                     request_info);
 }
 
 }  // namespace content