[ash-md] Keeps overview mode shield above DesktopBackgroundView

ash/common/wm/overview/window_grid.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 "ash/common/wm/overview/window_grid.h"
 
 #include <algorithm>
 #include <functional>
 #include <set>
 #include <utility>
@@ skipping 835 matching lines @@
            ->GetBackgroundType() == SHELF_BACKGROUND_MAXIMIZED)
           ? 1.f
           : 0.f;
   shield_widget_.reset(CreateBackgroundWidget(
       root_window_, kShieldColor, 0, 0, SK_ColorTRANSPARENT, initial_opacity));
 
   WmWindow* widget_window =
       WmLookup::Get()->GetWindowForWidget(shield_widget_.get());
   const gfx::Rect bounds = widget_window->GetParent()->GetBounds();
   widget_window->SetBounds(bounds);
+  widget_window->SetName("OverviewModeShield");
 
   ui::ScopedLayerAnimationSettings animation_settings(
       widget_window->GetLayer()->GetAnimator());
   animation_settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
       kOverviewSelectorTransitionMilliseconds));
   animation_settings.SetTweenType(gfx::Tween::LINEAR_OUT_SLOW_IN);
   animation_settings.SetPreemptionStrategy(
       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
   shield_widget_->SetOpacity(kShieldOpacity);
 }
@@ skipping 11 matching lines @@
   selection_widget_.reset(
       CreateBackgroundWidget(root_window_, selection_color, border_thickness,
                              border_radius, border_color, 0.f));
   WmWindow* widget_window =
       WmLookup::Get()->GetWindowForWidget(selection_widget_.get());
   const gfx::Rect target_bounds =
       root_window_->ConvertRectFromScreen(SelectedWindow()->target_bounds());
   gfx::Vector2d fade_out_direction =
       GetSlideVectorForFadeIn(direction, target_bounds);
   widget_window->SetBounds(target_bounds - fade_out_direction);
+  widget_window->SetName("OverviewModeSelector");
 
   if (material) {
     selector_shadow_.reset(new ::wm::Shadow());
     selector_shadow_->Init(::wm::Shadow::STYLE_ACTIVE);
     selector_shadow_->layer()->SetVisible(true);
     selection_widget_->GetLayer()->SetMasksToBounds(false);
     selection_widget_->GetLayer()->Add(selector_shadow_->layer());
     selector_shadow_->SetContentBounds(gfx::Rect(target_bounds.size()));
   }
 }
@@ skipping 154 matching lines @@
         *min_right = left;
       if (*max_right < left)
         *max_right = left;
     }
     *max_bottom = top + height;
   }
   return windows_fit;
 }
 
 }  // namespace ash