Undocks window first before side-snapping bounds

ash/wm/workspace/snap_sizer.cc

Index: ash/wm/workspace/snap_sizer.cc
diff --git a/ash/wm/workspace/snap_sizer.cc b/ash/wm/workspace/snap_sizer.cc
index f101441f209608c4fc914da8eccacb34c5408a12..493042f8f22091758d5a9ece6eba25fa185071a9 100644
--- a/ash/wm/workspace/snap_sizer.cc
+++ b/ash/wm/workspace/snap_sizer.cc
@@ -166,11 +166,16 @@ void SnapSizer::SnapWindow(wm::WindowState* window_state,
     return;
   internal::SnapSizer sizer(window_state, gfx::Point(), edge,
       internal::SnapSizer::OTHER_INPUT);
+  window_state->SetWindowShowType(edge == LEFT_EDGE ?
+      wm::SHOW_TYPE_LEFT_SNAPPED : wm::SHOW_TYPE_RIGHT_SNAPPED);
   SnapWindowToBounds(window_state, edge,
                      sizer.GetSnapBounds(window_state->window()->bounds()));
 }
 
 void SnapSizer::SnapWindowToTargetBounds() {
+  window_state_->SetWindowShowType(edge_ == LEFT_EDGE ?
+      wm::SHOW_TYPE_LEFT_SNAPPED : wm::SHOW_TYPE_RIGHT_SNAPPED);
+  target_bounds_ = GetTargetBounds();
   SnapWindowToBounds(window_state_, edge_, target_bounds());
 }