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..bfc11cadb7d238b92c347d5077167a97f0c03e03 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
@@ -61,6 +66,9 @@ class View;
 // so that BridgedNativeWidget can dynamically enable dragging of the window.
 @property(assign) BOOL mouseDownCanMoveWindow;
 
+// When |flag| is YES, will make BridgedContentView ignore all mouse events.
++ (void)setIgnoreMouseEvents:(BOOL)flag;
+
 // Initialize the NSView -> views::View bridge. |viewToHost| must be non-NULL.
 - (id)initWithView:(views::View*)viewToHost;