Force new surface on BrowserPluginGuest reattach.

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 8be87ea534e50001aea2e9176ce6b34c0ebfb4a5..03a2a800aadc3624debcfe64ef4b6df9dda51ee9 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -250,9 +250,7 @@ void RenderWidgetHostViewChildFrame::OnSwapCompositorFrame(
   if (output_surface_id != last_output_surface_id_ ||
       frame_size != current_surface_size_ ||
       scale_factor != current_surface_scale_factor_) {
-    if (surface_factory_ && !surface_id_.is_null())
-      surface_factory_->Destroy(surface_id_);
-    surface_id_ = cc::SurfaceId();
+    ClearCompositorSurfaceIfNecessary();
     last_output_surface_id_ = output_surface_id;
     current_surface_size_ = frame_size;
     current_surface_scale_factor_ = scale_factor;
@@ -418,4 +416,10 @@ RenderWidgetHostViewChildFrame::CreateBrowserAccessibilityManager(
       BrowserAccessibilityManager::GetEmptyDocument(), delegate);
 }
 
+void RenderWidgetHostViewChildFrame::ClearCompositorSurfaceIfNecessary() {
+  if (surface_factory_ && !surface_id_.is_null())
+    surface_factory_->Destroy(surface_id_);
+  surface_id_ = cc::SurfaceId();
+}
+
 }  // namespace content