MacViews: Implement Tab Dragging

ui/views/cocoa/bridged_content_view.mm

Index: ui/views/cocoa/bridged_content_view.mm
diff --git a/ui/views/cocoa/bridged_content_view.mm b/ui/views/cocoa/bridged_content_view.mm
index 6022a44723bf99d9873d04bd6dcbebdb7bc66697..4966c4601308e7fa57bac8e1b6668ec582dcf2b2 100644
--- a/ui/views/cocoa/bridged_content_view.mm
+++ b/ui/views/cocoa/bridged_content_view.mm
@@ -31,6 +31,8 @@ using views::MenuController;
 
 namespace {
 
+bool g_ignore_mouse_events = false;
+
 // Returns true if all four corners of |rect| are contained inside |path|.
 bool IsRectInsidePath(NSRect rect, NSBezierPath* path) {
   return [path containsPoint:rect.origin] &&
@@ -198,6 +200,7 @@ gfx::Rect GetFirstRectForRangeHelper(const ui::TextInputClient* client,
 @synthesize hostedView = hostedView_;
 @synthesize textInputClient = textInputClient_;
 @synthesize drawMenuBackgroundForBlur = drawMenuBackgroundForBlur_;
+@synthesize ignoreMouseEvents = ignoreMouseEvents_;
 @synthesize mouseDownCanMoveWindow = mouseDownCanMoveWindow_;
 
 - (id)initWithView:(views::View*)viewToHost {
@@ -223,6 +226,11 @@ gfx::Rect GetFirstRectForRangeHelper(const ui::TextInputClient* client,
   return self;
 }
 
+- (void)setIgnoreMouseEvents:(BOOL)flag {
+  ignoreMouseEvents_ = flag;
+  g_ignore_mouse_events = flag;
+}
+
 - (void)clearView {
   textInputClient_ = nullptr;
   hostedView_ = nullptr;
@@ -231,6 +239,10 @@ gfx::Rect GetFirstRectForRangeHelper(const ui::TextInputClient* client,
 }
 
 - (void)processCapturedMouseEvent:(NSEvent*)theEvent {
+  if (CGEventGetIntegerValueField([theEvent CGEvent], kCGEventSourceUserData)) {
+    return;
+  }
+
   if (!hostedView_)
     return;
 
@@ -389,7 +401,11 @@ gfx::Rect GetFirstRectForRangeHelper(const ui::TextInputClient* client,
 // Translates the location of |theEvent| to toolkit-views coordinates and passes
 // the event to NativeWidgetMac for handling.
 - (void)mouseEvent:(NSEvent*)theEvent {
-  if (!hostedView_)
+  if (CGEventGetIntegerValueField([theEvent CGEvent], kCGEventSourceUserData)) {
+    return;
+  }
+
+  if (!hostedView_ || g_ignore_mouse_events)
     return;
 
   ui::MouseEvent event(theEvent);