Expand Chrome OS ARC support to create one tree source per package

components/exo/wm_helper.cc

 // Copyright 2016 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 "components/exo/wm_helper.h"
 
 #include "base/memory/ptr_util.h"
 
 namespace exo {
 namespace {
 WMHelper* g_instance = nullptr;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WMHelper, public:
 
 WMHelper::WMHelper() {}
 
 WMHelper::~WMHelper() {}
 
 // static
 void WMHelper::SetInstance(WMHelper* helper) {
   DCHECK_NE(!!helper, !!g_instance);
   g_instance = helper;
 }
 
 // static
 WMHelper* WMHelper::GetInstance() {
-  DCHECK(g_instance);

[reveman, 2017/05/11 13:01:35]

Should we be calling WMHelper::SetInstance in the test instead of this is
actually used?

[David Tseng, 2017/05/11 17:20:47]

Thanks, that's a better way to do it.

   return g_instance;
 }
 
 void WMHelper::AddActivationObserver(ActivationObserver* observer) {
   activation_observers_.AddObserver(observer);
 }
 
 void WMHelper::RemoveActivationObserver(ActivationObserver* observer) {
   activation_observers_.RemoveObserver(observer);
 }
@@ skipping 95 matching lines @@
   for (InputDeviceEventObserver& observer : input_device_event_observers_)
     observer.OnKeyboardDeviceConfigurationChanged();
 }
 
 void WMHelper::NotifyDisplayConfigurationChanged() {
   for (DisplayConfigurationObserver& observer : display_config_observers_)
     observer.OnDisplayConfigurationChanged();
 }
 
 }  // namespace exo