[ash-md] Erases the pre-MD code path for Overview Mode

ash/common/wm/overview/scoped_transform_overview_window.h

 // 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.
 
 #ifndef ASH_COMMON_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 #define ASH_COMMON_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 74 matching lines @@
   void BeginScopedAnimation(OverviewAnimationType animation_type,
                             ScopedAnimationSettings* animation_settings);
 
   // Returns true if this window selector window contains the |target|.
   bool Contains(const WmWindow* target) const;
 
   // Returns the original target bounds of all transformed windows.
   gfx::Rect GetTargetBoundsInScreen() const;
 
   // Calculates the bounds of a |window_| after being transformed to the
-  // selector's space. With Material Design those bounds are a union of all
-  // regular (normal and panel) windows in the |window_|'s transient hierarchy.
-  // The returned Rect is in virtual screen coordinates. When |hide_header| is
-  // true the returned bounds are adjusted to allow the original |window_|'s
-  // header to be hidden.
-  gfx::Rect GetTransformedBounds(bool hide_header) const;
+  // selector's space. Those bounds are a union of all regular (normal and
+  // panel) windows in the |window_|'s transient hierarchy. The returned Rect is
+  // in virtual screen coordinates. The returned bounds are adjusted to allow
+  // the original |window_|'s header to be hidden.
+  gfx::Rect GetTransformedBounds() const;
 
   // Returns TOP_VIEW_COLOR property of |window_| unless there are transient
   // ancestors in which case returns SK_ColorTRANSPARENT.
   SkColor GetTopColor() const;
 
   // Returns TOP_VIEW_INSET property of |window_| unless there are transient
   // ancestors in which case returns 0.
   int GetTopInset() const;
 
   // Restores and animates the managed window to it's non overview mode state.
   void RestoreWindow();
 
   // Forces the managed window to be shown (ie not hidden or minimized) when
   // calling RestoreWindow().
   void ShowWindowOnExit();
 
   // Informs the ScopedTransformOverviewWindow that the window being watched was
   // destroyed. This resets the internal window pointer.
   void OnWindowDestroyed();
 
   // Prepares for overview mode by doing any necessary actions before entering.
   void PrepareForOverview();
 
   // Applies the |transform| to the overview window and all of its transient
   // children.
-  void SetTransform(WmWindow* root_window,
-                    const gfx::Transform& transform,
-                    bool use_mask);
+  void SetTransform(WmWindow* root_window, const gfx::Transform& transform);
 
   // Set's the opacity of the managed windows.
   void SetOpacity(float opacity);
 
   // Creates a mask layer with the bottom edge using rounded corners of
-  // |radius|. When |use_mask| is set, hides the original window header and uses
-  // rounded rectangle mask which may be resource-intensive. When |use_shape| is
-  // set and |use_mask| is not, uses SetAlphaShape to mask the header.
-  void HideHeaderAndSetShape(bool use_mask, bool use_shape, int radius);
+  // |radius|. Uses SetAlphaShape to mask the header.
+  void HideHeaderAndSetShape(int radius);
 
   // Restores original window shape and removes the mask if installed. Safe to
   // call even if HideHeaderAndSetShape() has not been called.
   void ShowHeaderAndResetShape();
 
   WmWindow* window() const { return window_; }
 
   // Closes the transient root of the window managed by |this|.
   void Close();
 
@@ skipping 11 matching lines @@
 
   // Closes the window managed by |this|.
   void CloseWidget();
 
   // Makes Close() execute synchronously when used in tests.
   static void SetImmediateCloseForTests();
 
   // A weak pointer to the real window in the overview.
   WmWindow* window_;
 
-  // Mask layer that hides the original window header.
-  std::unique_ptr<OverviewContentMask> mask_;
-
   // Original window shape, if it was set on a window.
   std::unique_ptr<SkRegion> original_window_shape_;
 
   // True after the |original_window_shape_| has been set or after it has
   // been determined that window shape was not originally set on the |window_|.
   bool determined_original_window_shape_;
 
   // Original visibility of |window_| upon entering overview mode that needs to
   // be restored unless the window gets selected.
   OriginalVisibility original_visibility_;
@@ skipping 15 matching lines @@
   float original_opacity_;
 
   base::WeakPtrFactory<ScopedTransformOverviewWindow> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedTransformOverviewWindow);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_