Make PageScaleFactor work for oopif subframes.

content/browser/renderer_host/render_widget_host_view_base.cc

Index: content/browser/renderer_host/render_widget_host_view_base.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_base.cc b/content/browser/renderer_host/render_widget_host_view_base.cc
index 11482ff5115d32feb1d58a22e2fd092ea1fc6c5f..3d6419e2a06e6b20e612651245a7c8067cb3f8d7 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.cc
+++ b/content/browser/renderer_host/render_widget_host_view_base.cc
@@ -308,6 +308,15 @@ void RenderWidgetHostViewBase::DidUnregisterFromTextInputManager(
   text_input_manager_ = nullptr;
 }
 
+void RenderWidgetHostViewBase::SetPageScaleFactorForSubframes(
+    float page_scale) {
+  RenderWidgetHostImpl* host =
+      RenderWidgetHostImpl::From(GetRenderWidgetHost());
+
+  if (host && host->delegate())
+    host->delegate()->SetPageScaleFactorForSubframes(page_scale);
+}
+
 base::WeakPtr<RenderWidgetHostViewBase> RenderWidgetHostViewBase::GetWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }