Add framework for sending feedback for Blimp.

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 {
+// Denotes whether Blimp is supported in the current.
+extern const char kFeedbackSupportedKey[];
+
+// Creates a data object containing data about Blimp to be used for feedback.
+std::unordered_map<std::string, std::string> CreateBlimpFeedbackData();
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_CORE_FEEDBACK_BLIMP_FEEDBACK_DATA_H_