[ash-md] Corrects initial positioning of the overview headers

ash/common/wm/overview/window_selector_item.cc

 // Copyright 2013 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_selector_item.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/common/material_design/material_design_controller.h"
@@ skipping 478 matching lines @@
   }
   FadeOut(std::move(window_label_));
 }
 
 void WindowSelectorItem::ShowWindowOnExit() {
   transform_window_.ShowWindowOnExit();
 }
 
 void WindowSelectorItem::PrepareForOverview() {
   transform_window_.PrepareForOverview();
+  UpdateHeaderLayout(HeaderFadeInMode::ENTER,
+                     OverviewAnimationType::OVERVIEW_ANIMATION_NONE);
 }
 
 bool WindowSelectorItem::Contains(const WmWindow* target) const {
   return transform_window_.Contains(target);
 }
 
 void WindowSelectorItem::SetBounds(const gfx::Rect& target_bounds,
                                    OverviewAnimationType animation_type) {
   if (in_bounds_update_)
     return;
@@ skipping 249 matching lines @@
     // the parent layer bounds change during the animation since
     // Shadow::UpdateLayerBounds() only happens before the animation starts.
     if (ash::MaterialDesignController::GetMode() ==
         ash::MaterialDesignController::Mode::MATERIAL_EXPERIMENTAL) {
       shadow_.reset(new ::wm::Shadow());
       shadow_->Init(::wm::Shadow::STYLE_INACTIVE);
       shadow_->layer()->SetVisible(true);
       window_label_->GetLayer()->Add(shadow_->layer());
     }
     window_label_->GetLayer()->SetMasksToBounds(false);
-    UpdateHeaderLayout(HeaderFadeInMode::ENTER,
-                       OverviewAnimationType::OVERVIEW_ANIMATION_NONE);
   } else {
     // Indicate that the label will be drawn onto a transparent background
     // (disables subpixel antialiasing).
     window_label_button_view_->SetBackgroundColorHint(SK_ColorTRANSPARENT);
     window_label_->SetContentsView(window_label_button_view_);
   }
 }
 
 void WindowSelectorItem::UpdateHeaderLayout(
     HeaderFadeInMode mode,
@@ skipping 121 matching lines @@
   window_selector_->delegate()->AddDelayedAnimationObserver(
       std::move(observer));
   widget_ptr->SetOpacity(0.f);
 }
 
 gfx::SlideAnimation* WindowSelectorItem::GetBackgroundViewAnimation() {
   return background_view_ ? background_view_->animation() : nullptr;
 }
 
 }  // namespace ash