Add PluginMessageLoopProxy and use it for Host plugin UI thread.

remoting/host/chromoting_host_unittest.cc

 // Copyright (c) 2011 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/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop_proxy.h"
 #include "base/task.h"
 #include "remoting/host/capturer_fake.h"
 #include "remoting/host/chromoting_host.h"
@@ skipping 60 matching lines @@
   virtual void SetUp() OVERRIDE {
     message_loop_proxy_ = base::MessageLoopProxy::CreateForCurrentThread();
     config_ = new InMemoryHostConfig();
     ON_CALL(context_, main_message_loop())
         .WillByDefault(Return(&message_loop_));
     ON_CALL(context_, encode_message_loop())
         .WillByDefault(Return(&message_loop_));
     ON_CALL(context_, network_message_loop())
         .WillByDefault(Return(message_loop_proxy_.get()));
     ON_CALL(context_, ui_message_loop())
-        .WillByDefault(Return(&message_loop_));
+        .WillByDefault(Return(message_loop_proxy_.get()));
     EXPECT_CALL(context_, main_message_loop())
         .Times(AnyNumber());
     EXPECT_CALL(context_, encode_message_loop())
         .Times(AnyNumber());
     EXPECT_CALL(context_, network_message_loop())
         .Times(AnyNumber());
     EXPECT_CALL(context_, ui_message_loop())
         .Times(AnyNumber());
 
-    context_.SetUITaskPostFunction(base::Bind(
-        static_cast<void(MessageLoop::*)(
-            const tracked_objects::Location&,
-            const base::Closure&)>(&MessageLoop::PostTask),
-        base::Unretained(&message_loop_)));
-
     Capturer* capturer = new CapturerFake();
     event_executor_ = new MockEventExecutor();
     curtain_ = new MockCurtain();
     disconnect_window_ = new MockDisconnectWindow();
     continue_window_ = new MockContinueWindow();
     local_input_monitor_ = new MockLocalInputMonitor();
     desktop_environment_.reset(
         new DesktopEnvironment(&context_, capturer, event_executor_, curtain_,
                                disconnect_window_, continue_window_,
                                local_input_monitor_));
@@ skipping 390 matching lines @@
     EXPECT_CALL(*connection_.get(), Disconnect())
         .InSequence(s1, s2)
         .RetiresOnSaturation();
   }
   SimulateClientConnection(0, true);
   message_loop_.Run();
   host_->set_it2me(false);
   EXPECT_THAT(curtain_activated, false);
 }
 }  // namespace remoting