app_list: Fix shadow bleeds over launcher button and steals mouse events

ui/aura/window.cc

 // Copyright (c) 2012 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 "ui/aura/window.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 11 matching lines @@
 #include "ui/aura/event_filter.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/animation/multi_animation.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/path.h"
 #include "ui/gfx/screen.h"
 
 namespace aura {
 
 namespace {
 
 Window* GetParentForWindow(Window* window, Window* suggested_parent) {
   if (suggested_parent)
     return suggested_parent;
   if (client::GetStackingClient())
@@ skipping 393 matching lines @@
 bool Window::ContainsPoint(const gfx::Point& local_point) {
   gfx::Rect local_bounds(gfx::Point(), bounds().size());
   return local_bounds.Contains(local_point);
 }
 
 bool Window::HitTest(const gfx::Point& local_point) {
   // Expand my bounds for hit testing (override is usually zero but it's
   // probably cheaper to do the math every time than to branch).
   gfx::Rect local_bounds(gfx::Point(), bounds().size());
   local_bounds.Inset(hit_test_bounds_override_outer_);
-  // TODO(beng): hittest masks.
-  return local_bounds.Contains(local_point);
+
+  if (!delegate_ || !delegate_->HasHitTestMask())
+    return local_bounds.Contains(local_point);
+
+  gfx::Path mask;
+  delegate_->GetHitTestMask(&mask);
+
+  SkRegion clip_region;
+  clip_region.setRect(local_bounds.x(), local_bounds.y(),
+                      local_bounds.width(), local_bounds.height());
+  SkRegion mask_region;
+  return mask_region.setPath(mask, clip_region) &&
+      mask_region.contains(local_point.x(), local_point.y());
 }
 
 Window* Window::GetEventHandlerForPoint(const gfx::Point& local_point) {
   return GetWindowForPoint(local_point, true, true);
 }
 
 Window* Window::GetTopWindowContainingPoint(const gfx::Point& local_point) {
   return GetWindowForPoint(local_point, false, false);
 }
 
@@ skipping 413 matching lines @@
   for (Windows::const_reverse_iterator it = children_.rbegin(),
            rend = children_.rend();
        it != rend; ++it) {
     Window* child = *it;
     child->PrintWindowHierarchy(depth + 1);
   }
 }
 #endif
 
 }  // namespace aura