[Extensions Toolbar] Protect against crazy bounds

chrome/browser/ui/toolbar/toolbar_actions_bar.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_BAR_H_
 #define CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_BAR_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 83 matching lines @@
   // Returns the [minimum|maximum] possible width for the toolbar.
   int GetMinimumWidth() const;
   int GetMaximumWidth() const;
 
   // Returns the width for the given number of icons.
   int IconCountToWidth(int icons) const;
 
   // Returns the number of icons that can fit within the given width.
   size_t WidthToIconCount(int width) const;
 
-  // Returns the number of icons that should be displayed.
+  // Returns the number of icons that should be displayed if space allows.
   size_t GetIconCount() const;
 
+  // Returns the starting index (inclusive) for displayable icons.
+  size_t GetStartIndexInBounds() const;
+
+  // Returns the ending index (exclusive) for displayable icons.
+  size_t GetEndIndexInBounds() const;
+
+  // Returns true if an overflow container is necessary to display any other
+  // icons.
+  bool NeedsOverflow() const;
+
   // Returns the frame (bounds) that the specified index should have, taking
   // into account if this is the main or overflow bar. If this is the overflow
   // bar and the index should not be displayed (i.e., it is shown on the main
   // bar), returns an empty rect.
   gfx::Rect GetFrameForIndex(size_t index) const;
 
   // Returns the actions in the proper order; this may differ from the
   // underlying order in the case of actions being popped out to show a popup.
   std::vector<ToolbarActionViewController*> GetActions() const;
 
@@ skipping 170 matching lines @@
   // The controller of the bubble to show once animation finishes, if any.
   scoped_ptr<extensions::ExtensionMessageBubbleController>
       pending_extension_bubble_controller_;
 
   base::WeakPtrFactory<ToolbarActionsBar> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ToolbarActionsBar);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_BAR_H_