MacViews: Implement Tab Dragging

ui/views/cocoa/bridged_content_view.h

Index: ui/views/cocoa/bridged_content_view.h
diff --git a/ui/views/cocoa/bridged_content_view.h b/ui/views/cocoa/bridged_content_view.h
index f4b6a867cd7c56da72d142f05aa21551bf6a6cc8..6b175c21da666251f500e50c9e16a8f765301566 100644
--- a/ui/views/cocoa/bridged_content_view.h
+++ b/ui/views/cocoa/bridged_content_view.h
@@ -17,6 +17,11 @@ class TextInputClient;
 
 namespace views {
 class View;
+
+// User data supplied in kCGEventSourceUserData for an event that should be
+// ignored.
+enum { kIgnoreEventUserData = 1 };
+
 }
 
 // The NSView that sits as the root contentView of the NSWindow, whilst it has
@@ -38,6 +43,8 @@ class View;
   // Whether the view is reacting to a keyDown event on the view.
   BOOL inKeyDown_;
 
+  BOOL ignoreMouseEvents_;
+
   // The last tooltip text, used to limit updates.
   base::string16 lastTooltipText_;
 
@@ -54,6 +61,7 @@ class View;
 
 @property(readonly, nonatomic) views::View* hostedView;
 @property(assign, nonatomic) ui::TextInputClient* textInputClient;
+@property(assign, nonatomic) BOOL ignoreMouseEvents;
 @property(assign, nonatomic) BOOL drawMenuBackgroundForBlur;
 
 // Extends an atomic, readonly property on NSView to make it assignable.