ash: Return empty shelf icon bounds before initialization.

ash/shelf/shelf_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shelf/shelf_view.h"
 
 #include <algorithm>
 #include <memory>
 
 #include "ash/ash_constants.h"
@@ skipping 299 matching lines @@
   if (overflow_bubble_)
     overflow_bubble_->Hide();
   // For crbug.com/587931, because AppListButton layout logic is in OnPaint.
   AppListButton* app_list_button = GetAppListButton();
   if (app_list_button)
     app_list_button->SchedulePaint();
 }
 
 gfx::Rect ShelfView::GetIdealBoundsOfItemIcon(ShelfID id) {
   int index = model_->ItemIndexByID(id);
-  if (index == -1)
+  if (index < 0 || last_visible_index_ < 0)
     return gfx::Rect();
   // Map all items from overflow area to the overflow button. Note that the
   // section between last_index_hidden_ and model_->FirstPanelIndex() is the
   // list of invisible panel items. However, these items are currently nowhere
   // represented and get dropped instead - see (crbug.com/378907). As such there
   // is no way to address them or place them. We therefore move them over the
   // overflow button.
   if (index > last_visible_index_ && index < model_->FirstPanelIndex())
     index = last_visible_index_ + 1;
   const gfx::Rect& ideal_bounds(view_model_->ideal_bounds(index));
@@ skipping 1429 matching lines @@
 
 int ShelfView::CalculateShelfDistance(const gfx::Point& coordinate) const {
   const gfx::Rect bounds = GetBoundsInScreen();
   int distance = wm_shelf_->SelectValueForShelfAlignment(
       bounds.y() - coordinate.y(), coordinate.x() - bounds.right(),
       bounds.x() - coordinate.x());
   return distance > 0 ? distance : 0;
 }
 
 }  // namespace ash