Add context to gfx::Screen calls in support of simultaneous desktop+ash

ui/views/widget/tooltip_manager_aura.cc

Index: ui/views/widget/tooltip_manager_aura.cc
diff --git a/ui/views/widget/tooltip_manager_aura.cc b/ui/views/widget/tooltip_manager_aura.cc
index 0636daea18a4d948f1762f299e5c9065b1f57fb9..2b76750a2963b3d9e8803902ca8e8698f89a51ef 100644
--- a/ui/views/widget/tooltip_manager_aura.cc
+++ b/ui/views/widget/tooltip_manager_aura.cc
@@ -28,9 +28,10 @@ gfx::Font TooltipManager::GetDefaultFont() {
 }
 
 // static
-int TooltipManager::GetMaxWidth(int x, int y) {
+int TooltipManager::GetMaxWidth(int x, int y, gfx::NativeView context) {
   gfx::Rect monitor_bounds =
-      gfx::Screen::GetDisplayNearestPoint(gfx::Point(x, y)).bounds();
+      gfx::Screen::GetScreenFor(context)->GetDisplayNearestPoint(
+          gfx::Point(x, y)).bounds();
   return (monitor_bounds.width() + 1) / 2;
 }