Aura: Make compositor_unittests work with --ui-enable-threaded-compositing

ui/compositor/compositor.cc

 // 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.
 
 #include "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 456 matching lines @@
   if (root_layer_)
     root_layer_->SetCompositor(NULL);
 
   // Stop all outstanding draws before telling the ContextFactory to tear
   // down any contexts that the |host_| may rely upon.
   host_.reset();
 
   ContextFactory::GetInstance()->RemoveCompositor(this);
 }
 
+// static
 void Compositor::Initialize(bool use_thread) {
   if (use_thread) {
     g_compositor_thread = new base::Thread("Browser Compositor");
     g_compositor_thread->Start();
   }
 }
 
+// static
+bool Compositor::WasInitializedWithThread() {
+  return !!g_compositor_thread;
+}
+
+// static
 void Compositor::Terminate() {
   if (g_compositor_thread) {
     g_compositor_thread->Stop();
     delete g_compositor_thread;
     g_compositor_thread = NULL;
   }
 }
 
 void Compositor::ScheduleDraw() {
   if (g_compositor_thread)
@@ skipping 235 matching lines @@
 COMPOSITOR_EXPORT void DisableTestCompositor() {
   ResetImplicitFactory();
   g_test_compositor_enabled = false;
 }
 
 COMPOSITOR_EXPORT bool IsTestCompositorEnabled() {
   return g_test_compositor_enabled;
 }
 
 }  // namespace ui