[Extensions Toolbar] Protect against crazy bounds

chrome/browser/ui/toolbar/toolbar_actions_bar.h

Index: chrome/browser/ui/toolbar/toolbar_actions_bar.h
diff --git a/chrome/browser/ui/toolbar/toolbar_actions_bar.h b/chrome/browser/ui/toolbar/toolbar_actions_bar.h
index 2e78ef387ce2eea9ee5504ecc69c2f9f54453679..5da8b241437175f770af9764d42eddc8af1c99e6 100644
--- a/chrome/browser/ui/toolbar/toolbar_actions_bar.h
+++ b/chrome/browser/ui/toolbar/toolbar_actions_bar.h
@@ -101,9 +101,19 @@ class ToolbarActionsBar : public ToolbarActionsModel::Observer {
   // 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