Make PageScaleFactor work for oopif subframes.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 95a45927753fc3a64f770e520c67a380f60e3c38..968b1b1cbc247b38d414ecc0671daac28bd521c3 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1015,6 +1015,17 @@ void WebContentsImpl::UpdateDeviceScaleFactor(double device_scale_factor) {
       new PageMsg_SetDeviceScaleFactor(MSG_ROUTING_NONE, device_scale_factor));
 }
 
+void WebContentsImpl::SetPageScaleFactorForSubframes(double page_scale_factor) {
+  RenderWidgetHostView* main_frame_view = GetMainFrame()->GetView();
+  for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
+    if (view && view != main_frame_view) {
+      RenderWidgetHost* host = view->GetRenderWidgetHost();
+      host->Send(new FrameMsg_SetPageScaleFactor(host->GetRoutingID(),
+                                                 page_scale_factor));
+    }
+  }
+}
+
 void WebContentsImpl::GetScreenInfo(ScreenInfo* screen_info) {
   if (GetView())
     GetView()->GetScreenInfo(screen_info);