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

ui/aura/test/test_window_delegate.h

Index: ui/aura/test/test_window_delegate.h
diff --git a/ui/aura/test/test_window_delegate.h b/ui/aura/test/test_window_delegate.h
index 294709d8681c7c3001138d62937bde5302020451..cb51290f1734580a72edc4eed6023c69cad741dd 100644
--- a/ui/aura/test/test_window_delegate.h
+++ b/ui/aura/test/test_window_delegate.h
@@ -9,6 +9,7 @@
 #include "base/compiler_specific.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/aura/window_delegate.h"
+#include "ui/gfx/rect.h"
 
 namespace aura {
 namespace test {
@@ -42,6 +43,8 @@ class TestWindowDelegate : public WindowDelegate {
   virtual void OnWindowDestroying() OVERRIDE;
   virtual void OnWindowDestroyed() OVERRIDE;
   virtual void OnWindowVisibilityChanged(bool visible) OVERRIDE;
+  virtual bool HasHitTestMask() const OVERRIDE;
+  virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE;
 
  private:
   int window_component_;
@@ -70,6 +73,21 @@ class ColorTestWindowDelegate : public TestWindowDelegate {
   DISALLOW_COPY_AND_ASSIGN(ColorTestWindowDelegate);
 };
 
+// A simple WindowDelegate that has a hit-test mask.
+class MaskedWindowDelegate : public TestWindowDelegate {
+ public:
+  explicit MaskedWindowDelegate(const gfx::Rect mask_rect);
+
+  // Overridden from TestWindowDelegate:
+  virtual bool HasHitTestMask() const OVERRIDE;
+  virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE;
+
+ private:
+  gfx::Rect mask_rect_;
+
+  DISALLOW_COPY_AND_ASSIGN(MaskedWindowDelegate);
+};
+
 }  // namespace test
 }  // namespace aura