Makes PlatformEventSource creation in Env conditional

content/browser/renderer_host/input/touch_emulator_unittest.cc

 // Copyright 2014 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 <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
@@ skipping 28 matching lines @@
     last_event_time_seconds_ =
         (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
     event_time_delta_seconds_ = 0.1;
   }
 
   virtual ~TouchEmulatorTest() {}
 
   // testing::Test
   virtual void SetUp() OVERRIDE {
 #if defined(USE_AURA)
-    aura::Env::CreateInstance();
+    aura::Env::CreateInstance(true);
     screen_.reset(aura::TestScreen::Create());
     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen_.get());
 #endif
 
     emulator_.reset(new TouchEmulator(this));
     emulator_->Enable(true /* allow_pinch */);
   }
 
   virtual void TearDown() OVERRIDE {
     emulator_->Disable();
@@ skipping 251 matching lines @@
   EXPECT_EQ(
       "TouchMove GestureScrollUpdate",
       ExpectedEvents());
   MouseUp(400, 200);
   EXPECT_EQ(
       "TouchEnd GestureScrollEnd",
       ExpectedEvents());
 }
 
 }  // namespace content