Remove TransparentActivateWindowButton from Overview Mode

ash/wm/overview/overview_window_targeter.h

+// Copyright 2015 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_WM_OVERVIEW_OVERVIEW_WINDOW_TARGETER_H_
+#define ASH_WM_OVERVIEW_OVERVIEW_WINDOW_TARGETER_H_
+
+#include "ui/aura/window_targeter.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace ash {
+
+// A targeter for the windows in the overview. Avoids propagating events to
+// window children and uses the WindowSelectorItem bounds to check for hits.
+class OverviewWindowTargeter : public aura::WindowTargeter {
+ public:
+  explicit OverviewWindowTargeter(aura::Window* target);
+
+  ~OverviewWindowTargeter() override;
+
+  // Sets the targetable bounds.
+  void set_bounds(const gfx::Rect& bounds) { bounds_ = bounds; }
+
+  // ui::EventTargeter:
+  ui::EventTarget* FindTargetForLocatedEvent(ui::EventTarget* target,
+                                             ui::LocatedEvent* event) override;
+
+ protected:
+  // ui::EventTargeter:
+  bool EventLocationInsideBounds(ui::EventTarget* target,
+                                 const ui::LocatedEvent& event) const override;
+
+ private:
+  // Bounds used to check for event hits in the root window coordinates.
+  gfx::Rect bounds_;
+
+  // Target to which events are redirected.
+  aura::Window* target_;
+
+  DISALLOW_COPY_AND_ASSIGN(OverviewWindowTargeter);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_OVERVIEW_OVERVIEW_WINDOW_TARGETER_H_