Explicit initialization of aura::Env for browser shell.

ui/aura/root_window.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/root_window.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 142 matching lines @@
       gesture_recognizer_(ui::GestureRecognizer::Create(this)),
       synthesize_mouse_move_(false),
       waiting_on_compositing_end_(false),
       draw_on_compositing_end_(false),
       defer_draw_scheduling_(false),
       move_hold_count_(0),
       held_event_factory_(this),
       repostable_event_factory_(this) {
   SetName("RootWindow");
 
+  Env::CreateInstance();

[dnicoara, 2013/09/10 19:15:00]

On OZONE builds this is needed since the minimal_shell doesn't create an
instance like in ash.

[Ben Goodger (Google), 2013/09/10 19:21:03]

Why not? Not sure I like this.

[dnicoara, 2013/09/10 19:56:55]

minimal_shell doesn't perform any aura calls, so it never needs to create the
aura Env. Should I just more this call there?

   compositor_.reset(new ui::Compositor(this, host_->GetAcceleratedWidget()));
   DCHECK(compositor_.get());
   compositor_->AddObserver(this);
 
   prop_.reset(new ui::ViewProp(host_->GetAcceleratedWidget(),
                                kRootWindowForAcceleratedWidget,
                                this));
 }
 
 RootWindow::~RootWindow() {
@@ skipping 1073 matching lines @@
 }
 
 gfx::Transform RootWindow::GetInverseRootTransform() const {
   float scale = ui::GetDeviceScaleFactor(layer());
   gfx::Transform transform;
   transform.Scale(1.0f / scale, 1.0f / scale);
   return transformer_->GetInverseTransform() * transform;
 }
 
 }  // namespace aura