Update viewport_to_dip_scale on bound compositor host

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index 2dfd47b08225281a6ab73d18b46997186c5ba63e..0baa32e1b2796778b62d20d085e3c136dc8ffc6e 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -2340,12 +2340,15 @@ PP_Bool PepperPluginInstanceImpl::BindGraphics(PP_Instance instance,
   if (compositor) {
     if (compositor->BindToInstance(this)) {
       bound_compositor_ = compositor;
+      bound_compositor_->set_viewport_to_dip_scale(viewport_to_dip_scale_);
       UpdateLayer(true);
       return PP_TRUE;
     }
   } else if (graphics_2d) {
     if (graphics_2d->BindToInstance(this)) {
       bound_graphics_2d_platform_ = graphics_2d;
+      bound_graphics_2d_platform_->set_viewport_to_dip_scale(
+          viewport_to_dip_scale_);
       UpdateLayer(true);
       return PP_TRUE;
     }