PlzNavigate: Create the speculative renderer earlier.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 0f5b5ce80f5c5d90e1363b53e76ea2395815b71d..477b3248b09a2a5c83760b74fd168fe7e31f8bc1 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -1678,16 +1678,14 @@ void RenderFrameHostImpl::Stop() {
 void RenderFrameHostImpl::DispatchBeforeUnload(bool for_navigation) {
   // TODO(creis): Support beforeunload on subframes.  For now just pretend that
   // the handler ran and allowed the navigation to proceed.
-  if (GetParent() || !IsRenderFrameLive()) {
-    // We don't have a live renderer, so just skip running beforeunload.
-    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-        switches::kEnableBrowserSideNavigation)) {
-      frame_tree_node_->navigator()->OnBeforeUnloadACK(
-          frame_tree_node_, true);
-    } else {
-      frame_tree_node_->render_manager()->OnBeforeUnloadACK(
-          for_navigation, true, base::TimeTicks::Now());
-    }
+  if (!ShouldDispatchBeforeUnload()) {
+    // There's no live renderer or this is a subframe, so just skip running
+    // BeforeUnload.
+    DCHECK(!base::CommandLine::ForCurrentProcess()->HasSwitch(
+               switches::kEnableBrowserSideNavigation) ||
+           !for_navigation);
+    frame_tree_node_->render_manager()->OnBeforeUnloadACK(
+        for_navigation, true, base::TimeTicks::Now());
     return;
   }
   TRACE_EVENT_ASYNC_BEGIN0(
@@ -1720,6 +1718,11 @@ void RenderFrameHostImpl::DispatchBeforeUnload(bool for_navigation) {
   }
 }
 
+bool RenderFrameHostImpl::ShouldDispatchBeforeUnload() {
+  // TODO(creis): Support beforeunload on subframes.
+  return !GetParent() && IsRenderFrameLive();
+}
+
 void RenderFrameHostImpl::DisownOpener() {
   Send(new FrameMsg_DisownOpener(GetRoutingID()));
 }