mac: Call setMouseDownCanMoveWindow in BrowserWindow

atom/browser/api/atom_api_browser_window.cc

@@ -1169,12 +1169,6 @@ void BrowserWindow::RemoveFromParentChildWindows() {
   parent->child_windows_.Remove(ID());
 }
 
-void BrowserWindow::UpdateDraggableRegions(
-    content::RenderFrameHost* rfh,
-    const std::vector<DraggableRegion>& regions) {
-  window_->UpdateDraggableRegions(regions);
-}
-
 void BrowserWindow::ScheduleUnresponsiveEvent(int ms) {
   if (!window_unresponsive_closure_.IsCancelled())
     return;

atom/browser/api/atom_api_browser_window_mac.mm

@@ -0,0 +1,31 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/api/atom_api_browser_window.h"
+
+#import <Cocoa/Cocoa.h>
+
+@interface NSView (WebContentsView)
+- (void)setMouseDownCanMoveWindow:(BOOL)can_move;
+@end
+
+namespace atom {
+
+namespace api {
+
+void BrowserWindow::UpdateDraggableRegions(
+    content::RenderFrameHost* rfh,
+    const std::vector<DraggableRegion>& regions) {
+  if (window_->has_frame())
+    return;
+  NSView* webView = web_contents()->GetNativeView();
+  if ([webView respondsToSelector:@selector(setMouseDownCanMoveWindow:)]) {
+    [webView setMouseDownCanMoveWindow:YES];
+  }
+  window_->UpdateDraggableRegions(regions);
+}
+
+}  // namespace api
+
+}  // namespace atom

atom/browser/api/atom_api_browser_window_views.cc

@@ -0,0 +1,19 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/api/atom_api_browser_window.h"
+
+namespace atom {
+
+namespace api {
+
+void BrowserWindow::UpdateDraggableRegions(
+    content::RenderFrameHost* rfh,
+    const std::vector<DraggableRegion>& regions) {
+  window_->UpdateDraggableRegions(regions);
+}
+
+}  // namespace api
+
+}  // namespace atom