Move the thread hop for UMA user actions from content:: to base::.

android_webview/browser/aw_metrics_service_client.cc

 // Copyright 2015 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 "android_webview/browser/aw_metrics_service_client.h"
 
 #include "android_webview/common/aw_version_info_values.h"
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/guid.h"
@@ skipping 196 matching lines @@
   return std::unique_ptr<::metrics::MetricsLogUploader>(
       new metrics::NetMetricsLogUploader(
           request_context_, metrics::kDefaultMetricsServerUrl,
           metrics::kDefaultMetricsMimeType, on_upload_complete));
 }
 
 base::TimeDelta AwMetricsServiceClient::GetStandardUploadInterval() {
   return base::TimeDelta::FromMinutes(kUploadIntervalMinutes);
 }
 
+scoped_refptr<base::SingleThreadTaskRunner>
+    AwMetricsServiceClient::GetMainThreadTaskRunner() {
+  return content::BrowserThread::GetMessageLoopProxyForThread(
+      content::BrowserThread::UI);
+}
+
 AwMetricsServiceClient::AwMetricsServiceClient()
     : is_initialized_(false),
       is_enabled_(false),
       pref_service_(nullptr),
       request_context_(nullptr) {}
 
 AwMetricsServiceClient::~AwMetricsServiceClient() {}
 
 bool AwMetricsServiceClient::is_reporting_enabled() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   return is_enabled_;
 }
 
 }  // namespace android_webview