Add a lock screen example.

ui/aura/window_unittest.cc

Index: ui/aura/window_unittest.cc
===================================================================
--- ui/aura/window_unittest.cc	(revision 103882)
+++ ui/aura/window_unittest.cc	(working copy)
@@ -585,7 +585,7 @@
       gfx::Rect(0, 0, 500, 500), NULL));
   scoped_ptr<Window> w11(CreateTestWindowWithDelegate(NULL, 11,
       gfx::Rect(0, 0, 500, 500), w1.get()));
-  scoped_ptr<Window> w111(CreateTestWindowWithDelegate(&d111, 1,
+  scoped_ptr<Window> w111(CreateTestWindowWithDelegate(&d111, 111,
       gfx::Rect(50, 50, 450, 450), w11.get()));
   scoped_ptr<Window> w12(CreateTestWindowWithDelegate(NULL, 12,
       gfx::Rect(0, 0, 500, 500), w1.get()));
@@ -594,5 +594,31 @@
   EXPECT_EQ(w111.get(), w1->GetEventHandlerForPoint(target_point));
 }
 
+// When set_consume_events() is called with |true| for a Window, that Window
+// should make sure that none behind it in the z-order see events if it has
+// children. If it does not have children, event targeting works as usual.
+TEST_F(WindowTest, ConsumesEvents) {
+  WindowDelegateImpl d11;
+  WindowDelegateImpl d121;
+  scoped_ptr<Window> w1(CreateTestWindowWithDelegate(NULL, 1,
+      gfx::Rect(0, 0, 500, 500), NULL));
+  scoped_ptr<Window> w11(CreateTestWindowWithDelegate(&d11, 11,
+      gfx::Rect(0, 0, 500, 500), w1.get()));
+  scoped_ptr<Window> w111(CreateTestWindowWithDelegate(NULL, 111,
+      gfx::Rect(50, 50, 450, 450), w11.get()));
+  scoped_ptr<Window> w12(CreateTestWindowWithDelegate(NULL, 12,
+      gfx::Rect(0, 0, 500, 500), w1.get()));
+  scoped_ptr<Window> w121(CreateTestWindowWithDelegate(&d121, 121,
+      gfx::Rect(150, 150, 50, 50), NULL));
+
+  w12->set_consumes_events(true);
+  EXPECT_EQ(w11.get(), w1->GetEventHandlerForPoint(gfx::Point(10, 10)));
+
+  w12->AddChild(w121.get());
+
+  EXPECT_EQ(NULL, w1->GetEventHandlerForPoint(gfx::Point(10, 10)));
+  EXPECT_EQ(w121.get(), w1->GetEventHandlerForPoint(gfx::Point(175, 175)));
+}
+
 }  // namespace internal
 }  // namespace aura