MacViews: Implement Tab Dragging

ui/events/cocoa/events_mac.mm

Index: ui/events/cocoa/events_mac.mm
diff --git a/ui/events/cocoa/events_mac.mm b/ui/events/cocoa/events_mac.mm
index e68c755984b066cdbff126e59e64c5050e74f052..114583a9f4b31e903a48485fe237cf6c0956d4ea 100644
--- a/ui/events/cocoa/events_mac.mm
+++ b/ui/events/cocoa/events_mac.mm
@@ -55,13 +55,19 @@ EventType EventTypeFromNative(const base::NativeEvent& native_event) {
     case NSAppKitDefined:
     case NSSystemDefined:
       return ET_UNKNOWN;
-    case NSFlagsChanged:
+    case NSEventTypeGesture:
+      DLOG(INFO) << "gesture??";
+      return ET_UNKNOWN;
+    case NSCursorUpdate:
+      DLOG(INFO) << "cursor update?";
+      return ET_UNKNOWN;
     case NSApplicationDefined:
+      DLOG(INFO) << "application defined?";
+      return ET_UNKNOWN;
+    case NSFlagsChanged:
     case NSPeriodic:
-    case NSCursorUpdate:
     case NSTabletPoint:
     case NSTabletProximity:
-    case NSEventTypeGesture:
     case NSEventTypeMagnify:
     case NSEventTypeRotate:
     case NSEventTypeBeginGesture: