Implement TouchSelectionEditing controls for OOPIF.

content/browser/frame_host/cross_process_frame_connector.cc

Index: content/browser/frame_host/cross_process_frame_connector.cc
diff --git a/content/browser/frame_host/cross_process_frame_connector.cc b/content/browser/frame_host/cross_process_frame_connector.cc
index 5fc3c272ef19dfb3f5df3afda32797ba782d5477..1ca49b4e402412afe8f5e5282ec3a5df73b00661 100644
--- a/content/browser/frame_host/cross_process_frame_connector.cc
+++ b/content/browser/frame_host/cross_process_frame_connector.cc
@@ -301,6 +301,10 @@ void CrossProcessFrameConnector::SetRect(const gfx::Rect& frame_rect) {
 
 RenderWidgetHostViewBase*
 CrossProcessFrameConnector::GetRootRenderWidgetHostView() {
+  // Tests may not have frame_proxy_in_parent_renderer_ set.
+  if (!frame_proxy_in_parent_renderer_)
+    return nullptr;
+
   RenderFrameHostImpl* top_host = frame_proxy_in_parent_renderer_->
       frame_tree_node()->frame_tree()->root()->current_frame_host();