Renderer-side changes for NoState Prefetch

chrome/renderer/prerender/prerender_helper.cc

Index: chrome/renderer/prerender/prerender_helper.cc
diff --git a/chrome/renderer/prerender/prerender_helper.cc b/chrome/renderer/prerender/prerender_helper.cc
index 2ea8d076cfdbce133dd32adc38bb1e0989b153b7..f3a32390aaece579f33ca52ec267b0c08ff038b8 100644
--- a/chrome/renderer/prerender/prerender_helper.cc
+++ b/chrome/renderer/prerender/prerender_helper.cc
@@ -34,9 +34,12 @@ void UpdateVisibilityState(content::RenderFrame* render_frame) {
 
 namespace prerender {
 
-PrerenderHelper::PrerenderHelper(content::RenderFrame* render_frame)
+PrerenderHelper::PrerenderHelper(content::RenderFrame* render_frame,
+                                 PrerenderMode prerender_mode)
     : content::RenderFrameObserver(render_frame),
-      content::RenderFrameObserverTracker<PrerenderHelper>(render_frame) {
+      content::RenderFrameObserverTracker<PrerenderHelper>(render_frame),
+      prerender_mode_(prerender_mode) {
+  DCHECK_NE(prerender_mode_, NO_PRERENDER);
   UpdateVisibilityState(render_frame);
 }
 
@@ -45,7 +48,18 @@ PrerenderHelper::~PrerenderHelper() {
 
 // static.
 bool PrerenderHelper::IsPrerendering(const content::RenderFrame* render_frame) {
-  return PrerenderHelper::Get(render_frame) != NULL;
+  return PrerenderHelper::GetPrerenderMode(render_frame) != NO_PRERENDER;
+}
+
+// static.
+PrerenderMode PrerenderHelper::GetPrerenderMode(
+    const content::RenderFrame* render_frame) {
+  PrerenderHelper* helper = PrerenderHelper::Get(render_frame);
+  if (!helper)
+    return NO_PRERENDER;
+
+  DCHECK_NE(helper->prerender_mode_, NO_PRERENDER);
+  return helper->prerender_mode_;
 }
 
 bool PrerenderHelper::OnMessageReceived(