[ash-md] Hides frame headers in overview mode not using a mask

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 765 matching lines @@
 void WindowGrid::OnWindowBoundsChanged(WmWindow* window,
                                        const gfx::Rect& old_bounds,
                                        const gfx::Rect& new_bounds) {
   auto iter = std::find_if(window_list_.begin(), window_list_.end(),
                            WindowSelectorItemComparator(window));
   DCHECK(iter != window_list_.end());
 
   // Immediately finish any active bounds animation.
   window->StopAnimatingProperty(ui::LayerAnimationElement::BOUNDS);
 
+  if (ash::MaterialDesignController::IsOverviewMaterial()) {
+    PositionWindows(false);
+    return;
+  }
   // Recompute the transform for the window.
   (*iter)->RecomputeWindowTransforms();
 }
 
 void WindowGrid::InitShieldWidget() {
   shield_widget_.reset(CreateBackgroundWidget(root_window_, kShieldColor, 0, 0,
                                               SK_ColorTRANSPARENT));
 
   WmWindow* widget_window =
       WmLookup::Get()->GetWindowForWidget(shield_widget_.get());
@@ skipping 161 matching lines @@
         *min_right = left;
       if (*max_right < left)
         *max_right = left;
     }
     *max_bottom = top + height;
   }
   return windows_fit;
 }
 
 }  // namespace ash