MacViews: Fix flashing of opaque non-modal windows on display.

ui/views/cocoa/bridged_native_widget.h

Index: ui/views/cocoa/bridged_native_widget.h
diff --git a/ui/views/cocoa/bridged_native_widget.h b/ui/views/cocoa/bridged_native_widget.h
index b0f59f0be6ea1deadbfafa4e47d495383c0bc49b..d1e2d08a516abbee267e4934cf6a2e15aee7b874 100644
--- a/ui/views/cocoa/bridged_native_widget.h
+++ b/ui/views/cocoa/bridged_native_widget.h
@@ -314,6 +314,11 @@ class VIEWS_EXPORT BridgedNativeWidget
   // shadow needs to be invalidated when a frame is received for the new shape.
   bool invalidate_shadow_on_frame_swap_ = false;
 
+  // Whether the window's visibility is suppressed currently. For opaque non-
+  // modal windows, the window's alpha value is set to 0, till the frame from
+  // the compositor arrives to avoid "blinking".
+  bool initial_visibility_suppressed_ = false;
+
   AssociatedViews associated_views_;
 
   DISALLOW_COPY_AND_ASSIGN(BridgedNativeWidget);