Field trial synchronization to PPAPI process.

content/ppapi_plugin/ppapi_thread.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 CONTENT_PPAPI_PLUGIN_PPAPI_THREAD_H_
 #define CONTENT_PPAPI_PLUGIN_PPAPI_THREAD_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/metrics/field_trial.h"
 #include "base/process/process.h"
 #include "base/scoped_native_library.h"
 #include "build/build_config.h"
+#include "components/variations/child_process_field_trial_syncer.h"
 #include "content/child/child_thread_impl.h"
 #include "content/public/common/pepper_plugin_info.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/trusted/ppp_broker.h"
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_globals.h"
 #include "ppapi/proxy/plugin_proxy_delegate.h"
 
 #if defined(OS_WIN)
@@ skipping 14 matching lines @@
 class PpapiBlinkPlatformImpl;
 
 #if defined(COMPILER_MSVC)
 // See explanation for other RenderViewHostImpl which is the same issue.
 #pragma warning(push)
 #pragma warning(disable: 4250)
 #endif
 
 class PpapiThread : public ChildThreadImpl,
                     public ppapi::proxy::PluginDispatcher::PluginDelegate,
-                    public ppapi::proxy::PluginProxyDelegate {
+                    public ppapi::proxy::PluginProxyDelegate,
+                    public base::FieldTrialList::Observer {
  public:
   PpapiThread(const base::CommandLine& command_line, bool is_broker);
   ~PpapiThread() override;
   void Shutdown() override;
 
  private:
   // Make sure the enum list in tools/histogram/histograms.xml is updated with
   // any change in this list.
   enum LoadResult {
     LOAD_SUCCESS,
@@ skipping 39 matching lines @@
   // Message handlers.
   void OnLoadPlugin(const base::FilePath& path,
                     const ppapi::PpapiPermissions& permissions);
   void OnCreateChannel(base::ProcessId renderer_pid,
                        int renderer_child_id,
                        bool incognito);
   void OnSetNetworkState(bool online);
   void OnCrash();
   void OnHang();
 
+  // base::FieldTrialList::Observer:
+  void OnFieldTrialGroupFinalized(const std::string& trial_name,
+                                  const std::string& group_name) override;
+
   // Sets up the channel to the given renderer. If |renderer_pid| is
   // base::kNullProcessId, the channel is set up to the browser. On success,
   // returns true and fills the given ChannelHandle with the information from
   // the new channel.
   bool SetupChannel(base::ProcessId renderer_pid,
                     int renderer_child_id,
                     bool incognito,
                     IPC::ChannelHandle* handle);
 
   // Sets up the name of the plugin for logging using the given path.
@@ skipping 42 matching lines @@
   uint32_t next_plugin_dispatcher_id_;
 
   // The BlinkPlatformImpl implementation.
   std::unique_ptr<PpapiBlinkPlatformImpl> blink_platform_impl_;
 
 #if defined(OS_WIN)
   // Caches the handle to the peer process if this is a broker.
   base::win::ScopedHandle peer_handle_;
 #endif
 
+  variations::ChildProcessFieldTrialSyncer field_trial_syncer_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(PpapiThread);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_PPAPI_PLUGIN_PPAPI_THREAD_H_