[ash-md] Makes sure that minimized windows can be activated in overview

ash/common/wm/overview/scoped_transform_overview_window.cc

Index: ash/common/wm/overview/scoped_transform_overview_window.cc
diff --git a/ash/common/wm/overview/scoped_transform_overview_window.cc b/ash/common/wm/overview/scoped_transform_overview_window.cc
index a98c169c0431abccc3bc003634d1b5fd1f7eadd8..e381a928c7bcff4672f01f8d70f3315551f50c20 100644
--- a/ash/common/wm/overview/scoped_transform_overview_window.cc
+++ b/ash/common/wm/overview/scoped_transform_overview_window.cc
@@ -445,8 +445,13 @@ WmWindow* ScopedTransformOverviewWindow::GetOverviewWindow() const {
   return window_;
 }
 
+void ScopedTransformOverviewWindow::EnsureVisible() {
+  original_opacity_ = 1.f;
+}
+
 void ScopedTransformOverviewWindow::OnGestureEvent(ui::GestureEvent* event) {
   if (event->type() == ui::ET_GESTURE_TAP) {
+    EnsureVisible();
     window_->Show();
     window_->Activate();
   }
@@ -454,6 +459,7 @@ void ScopedTransformOverviewWindow::OnGestureEvent(ui::GestureEvent* event) {
 
 void ScopedTransformOverviewWindow::OnMouseEvent(ui::MouseEvent* event) {
   if (event->type() == ui::ET_MOUSE_PRESSED && event->IsOnlyLeftMouseButton()) {
+    EnsureVisible();
     window_->Show();
     window_->Activate();
   }