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

base/test/user_action_tester.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 "base/test/user_action_tester.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/test/test_simple_task_runner.h"
 
 namespace base {
 
 UserActionTester::UserActionTester()
-    : action_callback_(
+    : task_runner_(new base::TestSimpleTaskRunner),
+      action_callback_(
           base::Bind(&UserActionTester::OnUserAction, base::Unretained(this))) {
+  base::SetRecordActionTaskRunner(task_runner_);
   base::AddActionCallback(action_callback_);
 }
 
 UserActionTester::~UserActionTester() {
   base::RemoveActionCallback(action_callback_);
 }
 
 int UserActionTester::GetActionCount(const std::string& user_action) const {
   UserActionCountMap::const_iterator iter = count_map_.find(user_action);
   return iter == count_map_.end() ? 0 : iter->second;
 }
 
 void UserActionTester::ResetCounts() {
   count_map_.clear();
 }
 
 void UserActionTester::OnUserAction(const std::string& user_action) {
   ++(count_map_[user_action]);
 }
 
 }  // namespace base