Move all wallpaper file loading and decoding from DesktopBackgroundController to WallpaperManager.

ash/test/ash_test_base.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 "ash/test/ash_test_base.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/ash_switches.h"
@@ skipping 189 matching lines @@
 }
 
 aura::test::EventGenerator& AshTestBase::GetEventGenerator() {
   if (!event_generator_) {
     event_generator_.reset(
         new aura::test::EventGenerator(new AshEventGeneratorDelegate()));
   }
   return *event_generator_.get();
 }
 
-// static
 bool AshTestBase::SupportsMultipleDisplays() {
-#if defined(OS_WIN)
-  return base::win::GetVersion() < base::win::VERSION_WIN8;
-#else
-  return true;
-#endif
+  return AshTestHelper::SupportsMultipleDisplays();
 }
 
-// static
 bool AshTestBase::SupportsHostWindowResize() {
-#if defined(OS_WIN)
-  return base::win::GetVersion() < base::win::VERSION_WIN8;
-#else
-  return true;
-#endif
+  return AshTestHelper::SupportsHostWindowResize();
 }
 
 void AshTestBase::UpdateDisplay(const std::string& display_specs) {
   DisplayManagerTestApi display_manager_test_api(
       Shell::GetInstance()->display_manager());
   display_manager_test_api.UpdateDisplay(display_specs);
 }
 
 aura::Window* AshTestBase::CurrentContext() {
   return ash_test_helper_->CurrentContext();
@@ skipping 116 matching lines @@
 
 void AshTestBase::UnblockUserSession() {
   Shell::GetInstance()->session_state_delegate()->UnlockScreen();
   SetSessionStarted(true);
   SetUserAddingScreenRunning(false);
 }
 
 
 }  // namespace test
 }  // namespace ash