Add GrabWindowSnapshotAsync tests

ui/aura/test/aura_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 "ui/aura/test/aura_test_base.h"
 
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/aura_test_helper.h"
 #include "ui/aura/test/test_window_delegate.h"
@@ skipping 51 matching lines @@
       0, 0.0166667f);
   ui::GestureConfiguration::set_fling_acceleration_curve_coefficients(
       1, -0.0238095f);
   ui::GestureConfiguration::set_fling_acceleration_curve_coefficients(
       2, 0.0452381f);
   ui::GestureConfiguration::set_fling_acceleration_curve_coefficients(
       3, 0.8f);
   ui::GestureConfiguration::set_fling_velocity_cap(15000.0f);
 
   helper_.reset(new AuraTestHelper(&message_loop_));
-  helper_->SetUp();
+  bool allow_test_contexts = true;
+  helper_->SetUp(allow_test_contexts);
 }
 
 void AuraTestBase::TearDown() {
   teardown_called_ = true;
 
   // Flush the message loop because we have pending release tasks
   // and these tasks if un-executed would upset Valgrind.
   RunAllPendingInMessageLoop();
 
   helper_->TearDown();
@@ skipping 17 matching lines @@
 void AuraTestBase::RunAllPendingInMessageLoop() {
   helper_->RunAllPendingInMessageLoop();
 }
 
 void AuraTestBase::ParentWindow(Window* window) {
   client::ParentWindowWithContext(window, root_window(), gfx::Rect());
 }
 
 }  // namespace test
 }  // namespace aura