Allow message center and related bubbles to render on Windows.

ui/views/controls/slide_out_view.cc

Index: ui/views/controls/slide_out_view.cc
diff --git a/ui/views/controls/slide_out_view.cc b/ui/views/controls/slide_out_view.cc
index 2ecf3cda6bc0b182cb5364872211b1fd3dbe8bfc..d7cb3f6ef5fed7f0157b206bec119dcadafd73cf 100644
--- a/ui/views/controls/slide_out_view.cc
+++ b/ui/views/controls/slide_out_view.cc
@@ -12,8 +12,12 @@ namespace views {
 
 SlideOutView::SlideOutView()
     : gesture_scroll_amount_(0.f) {
-  SetPaintToLayer(true);
-  SetFillsBoundsOpaquely(false);
+  // If accelerated compositing is not available, this widget tracks the
+  // OnSlideOut event but does not render any visible changes.
+  if (get_use_acceleration_when_possible()) {
+    SetPaintToLayer(true);
+    SetFillsBoundsOpaquely(false);
+  }
 }
 
 SlideOutView::~SlideOutView() {
@@ -43,11 +47,14 @@ void SlideOutView::OnGestureEvent(ui::GestureEvent* event) {
     // The scroll-update events include the incremental scroll amount.
     gesture_scroll_amount_ += event->details().scroll_x();
 
-    gfx::Transform transform;
-    transform.Translate(gesture_scroll_amount_, 0.0);
-    layer()->SetTransform(transform);
-    layer()->SetOpacity(
-        1.f - std::min(fabsf(gesture_scroll_amount_) / width(), 1.f));
+    if (get_use_acceleration_when_possible()) {
+      gfx::Transform transform;
+      transform.Translate(gesture_scroll_amount_, 0.0);
+      layer()->SetTransform(transform);
+      layer()->SetOpacity(
+          1.f - std::min(fabsf(gesture_scroll_amount_) / width(), 1.f));
+    }
+
   } else if (event->type() == ui::ET_GESTURE_SCROLL_END) {
     const float kScrollRatioForClosingNotification = 0.5f;
     float scrolled_ratio = fabsf(gesture_scroll_amount_) / width();
@@ -63,6 +70,9 @@ void SlideOutView::OnGestureEvent(ui::GestureEvent* event) {
 }
 
 void SlideOutView::RestoreVisualState() {
+  if (!get_use_acceleration_when_possible())
+    return;
+
   // Restore the layer state.
   const int kSwipeRestoreDurationMS = 150;
   ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
@@ -73,6 +83,11 @@ void SlideOutView::RestoreVisualState() {
 }
 
 void SlideOutView::SlideOutAndClose(SlideDirection direction) {
+  if (!get_use_acceleration_when_possible()) {
+    // No animations, so don't wait to fire the OnSlideOut event.
+    OnSlideOut();
+    return;
+  }
   const int kSwipeOutTotalDurationMS = 150;
   int swipe_out_duration = kSwipeOutTotalDurationMS * layer()->opacity();
   ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());