Restore original opacity when exiting overview

ash/wm/overview/window_selector_unittest.cc

Index: ash/wm/overview/window_selector_unittest.cc
diff --git a/ash/wm/overview/window_selector_unittest.cc b/ash/wm/overview/window_selector_unittest.cc
index e222fa4eb8e2a70257cd338727f384382b0ea06e..4611111f9149e4ca3d00c8b91679f47885c8cba3 100644
--- a/ash/wm/overview/window_selector_unittest.cc
+++ b/ash/wm/overview/window_selector_unittest.cc
@@ -1891,6 +1891,18 @@ TEST_F(WindowSelectorTest, BasicTextFiltering) {
   EXPECT_FALSE(GetWindowItemForWindow(grid_index, window0.get())->dimmed());
   EXPECT_FALSE(GetWindowItemForWindow(grid_index, window1.get())->dimmed());
   EXPECT_FALSE(GetWindowItemForWindow(grid_index, window2.get())->dimmed());
+
+  FilterItems("Foo");
+
+  EXPECT_NE(1.0f, window0->layer()->GetTargetOpacity());
+  EXPECT_NE(1.0f, window1->layer()->GetTargetOpacity());
+  EXPECT_NE(1.0f, window2->layer()->GetTargetOpacity());
+
+  ToggleOverview();
+
+  EXPECT_EQ(1.0f, window0->layer()->GetTargetOpacity());
+  EXPECT_EQ(1.0f, window1->layer()->GetTargetOpacity());
+  EXPECT_EQ(1.0f, window2->layer()->GetTargetOpacity());
 }
 
 // Tests selecting in the overview with dimmed and undimmed items.