Convert FieldTrialActivated to use mojo.

chrome/renderer/chrome_render_thread_observer.h

 // Copyright (c) 2012 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 CHROME_RENDERER_CHROME_RENDER_THREAD_OBSERVER_H_
 #define CHROME_RENDERER_CHROME_RENDER_THREAD_OBSERVER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/metrics/field_trial.h"
+#include "chrome/common/field_trial_recorder.mojom.h"
 #include "chrome/common/variations/child_process_field_trial_syncer.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "content/public/renderer/render_thread_observer.h"
 
 class GURL;
 struct ContentSettings;
 
 namespace base {
 class CommandLine;
 }
@@ skipping 43 matching lines @@
   void OnSetContentSettingsForCurrentURL(
       const GURL& url, const ContentSettings& content_settings);
   void OnSetContentSettingRules(const RendererContentSettingRules& rules);
   void OnGetCacheResourceStats();
   void OnSetFieldTrialGroup(const std::string& trial_name,
                             const std::string& group_name);
 
   static bool is_incognito_process_;
   std::unique_ptr<content::ResourceDispatcherDelegate> resource_delegate_;
   RendererContentSettingRules content_setting_rules_;
+  chrome::mojom::FieldTrialRecorderPtr field_trial_recorder_;
   chrome_variations::ChildProcessFieldTrialSyncer field_trial_syncer_;
 
   std::unique_ptr<visitedlink::VisitedLinkSlave> visited_link_slave_;
 
   base::WeakPtrFactory<ChromeRenderThreadObserver> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRenderThreadObserver);
 };
 
 #endif  // CHROME_RENDERER_CHROME_RENDER_THREAD_OBSERVER_H_