Add user name in the feedback data.

blimp/client/core/feedback/blimp_feedback_data.h

 // Copyright 2016 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 BLIMP_CLIENT_CORE_FEEDBACK_BLIMP_FEEDBACK_DATA_H_
 #define BLIMP_CLIENT_CORE_FEEDBACK_BLIMP_FEEDBACK_DATA_H_
 
 #include <string>
 #include <unordered_map>
 
 namespace blimp {
 namespace client {
 class BlimpContentsManager;
 
 // Denotes whether Blimp is supported in the current.
 extern const char kFeedbackSupportedKey[];
 // Denotes whether there exists any visible BlimpContents.
 extern const char kFeedbackHasVisibleBlimpContents[];
+// Denotes the user name for the current logged in user.
+extern const char kFeedbackUserNameKey[];
 
 // Creates a data object containing data about Blimp to be used for feedback.
 std::unordered_map<std::string, std::string> CreateBlimpFeedbackData(
-    BlimpContentsManager* blimp_contents_manager);
+    BlimpContentsManager* blimp_contents_manager,
+    const std::string& username);
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_CORE_FEEDBACK_BLIMP_FEEDBACK_DATA_H_