aura: Defer OutputSurface creation until widget is available

ui/compositor/compositor_unittest.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/run_loop.h"
 #include "base/thread_task_runner_handle.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/test/begin_frame_args_test.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 18 matching lines @@
   CompositorTest() {}
   ~CompositorTest() override {}
 
   void SetUp() override {
     task_runner_ = base::ThreadTaskRunnerHandle::Get();
 
     ui::ContextFactory* context_factory =
         ui::InitializeContextFactoryForTests(false);
 
     compositor_.reset(new ui::Compositor(context_factory, task_runner_));
-    compositor_->SetAcceleratedWidgetAndStartCompositor(
-        gfx::kNullAcceleratedWidget);
+    compositor_->SetAcceleratedWidget(gfx::kNullAcceleratedWidget);
   }
   void TearDown() override {
     compositor_.reset();
     ui::TerminateContextFactoryForTests();
   }
 
  protected:
   base::SingleThreadTaskRunner* task_runner() { return task_runner_.get(); }
   ui::Compositor* compositor() { return compositor_.get(); }
 
@@ skipping 69 matching lines @@
   EXPECT_CALL(test_observer2, OnSendBeginFrame(_)).Times(0);
   compositor()->RemoveBeginFrameObserver(&test_observer);
   compositor()->RemoveBeginFrameObserver(&test_observer2);
   compositor()->AddBeginFrameObserver(&test_observer2);
   Mock::VerifyAndClearExpectations(&test_observer2);
 
   compositor()->RemoveBeginFrameObserver(&test_observer2);
 }
 
 }  // namespace ui