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

ui/aura/window_unittest.cc

Index: ui/aura/window_unittest.cc
diff --git a/ui/aura/window_unittest.cc b/ui/aura/window_unittest.cc
index 5932a4cc74acd96a075b08a5a0587d3d82e03f5b..f0da477a3cb2ca069d24735b60e3674f98f0b6e3 100644
--- a/ui/aura/window_unittest.cc
+++ b/ui/aura/window_unittest.cc
@@ -4,6 +4,8 @@
 
 #include "ui/aura/window.h"
 
+#include <utility>
+
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/stringprintf.h"
@@ -322,6 +324,26 @@ TEST_F(WindowTest, HitTest) {
   // TODO(beng): clip Window to parent.
 }
 
+TEST_F(WindowTest, HitTestMask) {
+  Window w1(new MaskedWindowDelegate(gfx::Rect(5, 6, 20, 30)));
+  w1.Init(ui::LAYER_NOT_DRAWN);
+  w1.SetBounds(gfx::Rect(10, 20, 50, 60));
+  w1.Show();
+  w1.SetParent(NULL);
+
+  // Points inside the mask.
+  EXPECT_TRUE(w1.HitTest(gfx::Point(5, 6)));  // top-left
+  EXPECT_TRUE(w1.HitTest(gfx::Point(15, 21)));  // center
+  EXPECT_TRUE(w1.HitTest(gfx::Point(24, 35)));  // bottom-right
+
+  // Points outside the mask.
+  EXPECT_FALSE(w1.HitTest(gfx::Point(0, 0)));
+  EXPECT_FALSE(w1.HitTest(gfx::Point(60, 80)));
+  EXPECT_FALSE(w1.HitTest(gfx::Point(4, 6)));
+  EXPECT_FALSE(w1.HitTest(gfx::Point(5, 5)));
+  EXPECT_FALSE(w1.HitTest(gfx::Point(25, 36)));
+}
+
 TEST_F(WindowTest, GetEventHandlerForPoint) {
   scoped_ptr<Window> w1(
       CreateTestWindow(SK_ColorWHITE, 1, gfx::Rect(10, 10, 500, 500), NULL));
@@ -1680,7 +1702,7 @@ TEST_F(WindowTest, StackTransientsWhoseLayersHaveNoDelegate) {
 }
 
 class TestVisibilityClient : public client::VisibilityClient {
-public:
+ public:
   explicit TestVisibilityClient(RootWindow* root_window)
       : ignore_visibility_changes_(false) {
     client::SetVisibilityClient(root_window, this);