RenderWidget/RenderView: encapsulate ViewHostMsg_Show, etc, in a callback

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index d569350255fc98759f0de7ce89f7cd3374f98c42..c1ded93b197e118cab4e43d016136442f5ef72f5 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -2121,7 +2121,8 @@ gpu::GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
 void RenderThreadImpl::CreateView(mojom::CreateViewParamsPtr params) {
   CompositorDependencies* compositor_deps = this;
   // When bringing in render_view, also bring in webkit's glue and jsbindings.
-  RenderViewImpl::Create(compositor_deps, *params, false);
+  RenderViewImpl::Create(compositor_deps, *params,
+                         RenderWidget::ShowCallback());
 }
 
 void RenderThreadImpl::CreateFrame(mojom::CreateFrameParamsPtr params) {