Propagate window coordinates to out-of-process iframes renderers.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 1749f030298796bc0bf3883765a5b90acb2ba0a9..7b8c898c06d5ec3a943aede258f77687b79528d7 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1525,6 +1525,16 @@ void RenderWidget::OnUpdateScreenRects(const gfx::Rect& view_screen_rect,
   Send(new ViewHostMsg_UpdateScreenRects_ACK(routing_id()));
 }
 
+void RenderWidget::OnUpdateWindowScreenRect(
+    const gfx::Rect& window_screen_rect) {
+  if (screen_metrics_emulator_) {
+    screen_metrics_emulator_->OnUpdateWindowScreenRectMessage(
+        window_screen_rect);
+  } else {
+    window_screen_rect_ = window_screen_rect;
+  }
+}
+
 void RenderWidget::OnSetSurfaceIdNamespace(uint32_t surface_id_namespace) {
   if (compositor_)
     compositor_->SetSurfaceIdNamespace(surface_id_namespace);