Shelf: Hide overflow bubble when app launched from overflow.

ash/common/shelf/shelf_view.cc

Index: ash/common/shelf/shelf_view.cc
diff --git a/ash/common/shelf/shelf_view.cc b/ash/common/shelf/shelf_view.cc
index d99b9e76fdbea9a0df593b57f7a6eec0da50f799..83208d9917bd2bcdee123c7506309ebeae1c4649 100644
--- a/ash/common/shelf/shelf_view.cc
+++ b/ash/common/shelf/shelf_view.cc
@@ -438,6 +438,15 @@ void ShelfView::ButtonPressed(views::Button* sender,
   if (!ShouldEventActivateButton(sender, event))
     return;
 
+  // If this is the overflow shelf, |main_shelf_| will not be null. When an item
+  // is pressed on the overflow shelf, we want to hide the overflow bubble,
+  // which is associated with the main shelf. Button presses on the main shelf
+  // cause the overflow bubble to close itself via PointerWatcher functionality.
+  if (main_shelf_) {
+    if (main_shelf_->IsShowingOverflowBubble())

[msw, 2017/04/06 23:37:19]

optional nit: combine the nested if statements:
if (main_shelf_ && main_shelf_->IsShowingOverflowBubble())
  main_shelf_->ToggleOverflowBubble();

[sammiequon, 2017/04/06 23:55:22]

Done.

+      main_shelf_->ToggleOverflowBubble();
+  }
+
   // Record the index for the last pressed shelf item.
   last_pressed_index_ = view_model_->GetIndexOfView(sender);
   DCHECK_LT(-1, last_pressed_index_);