Add conversation_key to CastEventProto message.

chromecast/browser/metrics/cast_metrics_service_client.cc

 // Copyright 2014 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 "chromecast/browser/metrics/cast_metrics_service_client.h"
 
 #include "base/command_line.h"
 #include "base/guid.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
@@ skipping 148 matching lines @@
   return std::unique_ptr<::metrics::ClientInfo>();
 }
 
 bool CastMetricsServiceClient::IsOffTheRecordSessionActive() {
   // Chromecast behaves as "off the record" w/r/t recording browsing state,
   // but this value is about not disabling metrics because of it.
   return false;
 }
 
 int32_t CastMetricsServiceClient::GetProduct() {
-  // Chromecast currently uses the same product identifier as Chrome.
   return ::metrics::ChromeUserMetricsExtension::CHROME;
 }
 
 std::string CastMetricsServiceClient::GetApplicationLocale() {
   return base::i18n::GetConfiguredLocale();
 }
 
 bool CastMetricsServiceClient::GetBrand(std::string* brand_code) {
   return false;
 }
@@ skipping 225 matching lines @@
   external_metrics_->StopAndDestroy();
   external_metrics_ = nullptr;
   platform_metrics_->StopAndDestroy();
   platform_metrics_ = nullptr;
 #endif  // defined(OS_LINUX)
   metrics_service_->Stop();
 }
 
 }  // namespace metrics
 }  // namespace chromecast