MacViews: Implement SetCursor

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index 4062f9a2608908700384ada4a7dd91cabd089532..96d0170b7b5f2c5d8376ce76a6661a2ecdfbcbe8 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -204,6 +204,14 @@ void BridgedNativeWidget::AcquireCapture() {
     return;  // Capture on hidden windows is disallowed.
 
   mouse_capture_.reset(new CocoaMouseCapture(this));
+
+  // Initiating global event capture with addGlobalMonitorForEventsMatchingMask:
+  // will reset the mouse cursor to an arrow. Asking the window for an update
+  // here will restore what we want. However, it can sometimes cause the cursor
+  // to flicker, once, on the initial mouseDown.
+  // TOOD(tapted): Make this unnecessary by only asking for global mouse capture
+  // for the cases that need it (e.g. menus, but not drag and drop).
+  [window_ cursorUpdate:[NSApp currentEvent]];
 }
 
 void BridgedNativeWidget::ReleaseCapture() {
@@ -230,6 +238,10 @@ void* BridgedNativeWidget::GetNativeWindowProperty(const char* name) const {
   return [[GetWindowProperties() objectForKey:key] pointerValue];
 }
 
+void BridgedNativeWidget::SetCursor(NSCursor* cursor) {
+  [window_delegate_ setCursor:cursor];
+}
+
 void BridgedNativeWidget::OnWindowWillClose() {
   if (parent_)
     parent_->RemoveChildWindow(this);