Added text filtering to Overview Mode

ash/wm/overview/scoped_transform_overview_window.cc

Index: ash/wm/overview/scoped_transform_overview_window.cc
diff --git a/ash/wm/overview/scoped_transform_overview_window.cc b/ash/wm/overview/scoped_transform_overview_window.cc
index afc5b00471cfa656c028dda212e0cb4b1505ecd2..997a8f549bb88a6fed2ed913be6eec75f52e3588 100644
--- a/ash/wm/overview/scoped_transform_overview_window.cc
+++ b/ash/wm/overview/scoped_transform_overview_window.cc
@@ -97,7 +97,8 @@ ScopedTransformOverviewWindow::ScopedTransformOverviewWindow(
                  ui::SHOW_STATE_MINIMIZED),
       ignored_by_shelf_(ash::wm::GetWindowState(window)->ignored_by_shelf()),
       overview_started_(false),
-      original_transform_(window->layer()->GetTargetTransform()) {
+      original_transform_(window->layer()->GetTargetTransform()),
+      opacity_(window->layer()->opacity()) {
 }
 
 ScopedTransformOverviewWindow::~ScopedTransformOverviewWindow() {
@@ -119,6 +120,7 @@ ScopedTransformOverviewWindow::~ScopedTransformOverviewWindow() {
                            ui::SHOW_STATE_MINIMIZED);
     }
     ash::wm::GetWindowState(window_)->set_ignored_by_shelf(ignored_by_shelf_);
+    window_->layer()->SetOpacity(opacity_);
   }
 }