Fixes resizing windows outside their bounds with ash-mus

ash/aura/wm_window_aura.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 "ash/aura/wm_window_aura.h"
 
 #include "ash/aura/aura_layout_manager_adapter.h"
 #include "ash/aura/wm_root_window_controller_aura.h"
 #include "ash/aura/wm_shell_aura.h"
 #include "ash/common/ash_constants.h"
@@ skipping 778 matching lines @@
     return;
   }
   ResizeShadowController* resize_shadow_controller =
       Shell::GetInstance()->resize_shadow_controller();
   if (resize_shadow_controller)
     resize_shadow_controller->HideShadow(window_);
 }
 
 void WmWindowAura::InstallResizeHandleWindowTargeter(
     ImmersiveFullscreenController* immersive_fullscreen_controller) {
-  if (aura::Env::GetInstance()->mode() == aura::Env::Mode::MUS) {
-    // TODO(sky): I believe once ImmersiveFullscreenController is ported this
-    // won't be necessary in mash, but I need to verify that:
-    // http://crbug.com/548435.
-    return;
-  }
   window_->SetEventTargeter(base::MakeUnique<ResizeHandleWindowTargeter>(
       window_, immersive_fullscreen_controller));
 }
 
 void WmWindowAura::SetBoundsInScreenBehaviorForChildren(
     BoundsInScreenBehavior behavior) {
   window_->SetProperty(
       kUsesScreenCoordinatesKey,
       behavior == BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
 }
 
 void WmWindowAura::SetSnapsChildrenToPhysicalPixelBoundary() {
   wm::SetSnapsChildrenToPhysicalPixelBoundary(window_);
 }
 
 void WmWindowAura::SnapToPixelBoundaryIfNecessary() {
   wm::SnapWindowToPixelBoundary(window_);
 }
 
 void WmWindowAura::SetChildrenUseExtendedHitRegion() {
   children_use_extended_hit_region_ = true;
-  if (aura::Env::GetInstance()->mode() == aura::Env::Mode::MUS)
-    return;
-
   gfx::Insets mouse_extend(-kResizeOutsideBoundsSize, -kResizeOutsideBoundsSize,
                            -kResizeOutsideBoundsSize,
                            -kResizeOutsideBoundsSize);
   gfx::Insets touch_extend =
       mouse_extend.Scale(kResizeOutsideBoundsScaleForTouch);
+  // TODO: EasyResizeWindowTargeter makes it so children get events outside
+  // their bounds. This only works in mash when mash is providing the non-client
+  // frame. Mus needs to support an api for the WindowManager that enables
+  // events to be dispatched to windows outside the windows bounds that this
+  // function calls into. http://crbug.com/679056.
   window_->SetEventTargeter(base::MakeUnique<::wm::EasyResizeWindowTargeter>(
       window_, mouse_extend, touch_extend));
 }
 
 std::unique_ptr<views::View> WmWindowAura::CreateViewWithRecreatedLayers() {
   return base::MakeUnique<wm::WindowMirrorView>(this);
 }
 
 void WmWindowAura::AddObserver(WmWindowObserver* observer) {
   observers_.AddObserver(observer);
@@ skipping 151 matching lines @@
     observer.OnTransientChildAdded(this, Get(transient));
 }
 
 void WmWindowAura::OnTransientChildRemoved(aura::Window* window,
                                            aura::Window* transient) {
   for (auto& observer : transient_observers_)
     observer.OnTransientChildRemoved(this, Get(transient));
 }
 
 }  // namespace ash