Make the maximize button more easily hittable when there is a huge amount of tabs present

ash/wm/frame_painter.h

Index: ash/wm/frame_painter.h
diff --git a/ash/wm/frame_painter.h b/ash/wm/frame_painter.h
index 22365020e7b9e02db99bb86844f922a53a435ee7..742dfe7c1aa8f1b7e71301e731d9690524263dad 100644
--- a/ash/wm/frame_painter.h
+++ b/ash/wm/frame_painter.h
@@ -85,8 +85,8 @@ class ASH_EXPORT FramePainter : public aura::WindowObserver,
   gfx::Rect GetWindowBoundsForClientBounds(
       int top_height,
       const gfx::Rect& client_bounds) const;
-  int NonClientHitTest(views::NonClientFrameView* view,
-                       const gfx::Point& point);
+  int NonClientHitTest(const views::NonClientFrameView* view,
+                       const gfx::Point& point) const;
   gfx::Size GetMinimumSize(views::NonClientFrameView* view);
   gfx::Size GetMaximumSize(views::NonClientFrameView* view);