Mac: Make a stop-gap visual indicator for dropping URLs on the tab strip.

chrome/browser/cocoa/tab_strip_view.h

Index: chrome/browser/cocoa/tab_strip_view.h
diff --git a/chrome/browser/cocoa/tab_strip_view.h b/chrome/browser/cocoa/tab_strip_view.h
index 29aa0eb0f70ba2cac118e53b9ae7cc58aa2118ec..454f2a300b4f8aee812ded0da6dfd5f13238bb5d 100644
--- a/chrome/browser/cocoa/tab_strip_view.h
+++ b/chrome/browser/cocoa/tab_strip_view.h
@@ -21,9 +21,16 @@
 
   // Weak; the following come from the nib.
   NSButton* newTabButton_;
+
+  // Whether the drop-indicator arrow is shown, and if it is, the coordinate of
+  // its tip.
+  BOOL dropArrowShown_;
+  NSPoint dropArrowPosition_;
 }
 
 @property(assign, nonatomic) IBOutlet NSButton* newTabButton;
+@property(assign, nonatomic) BOOL dropArrowShown;
+@property(assign, nonatomic) NSPoint dropArrowPosition;
 
 @end