Various Prerender Service / Prerender LocalPredictor related changes.

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 62ed58d561c5d2e16e63c431673f2fb424053c0d..04f1008b8c4eebc7a145b3f2ce010cb85b9097f4 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -1533,6 +1533,10 @@ bool PrerenderManager::DoesRateLimitAllowPrerender(Origin origin) const {
   histograms_->RecordTimeBetweenPrerenderRequests(origin, elapsed_time);
   if (!config_.rate_limit_enabled)
     return true;
+  // The LocalPredictor may issue multiple prerenders simultaneously (if so
+  // configured), so no throttling.
+  if (origin == ORIGIN_LOCAL_PREDICTOR)
+    return true;
   return elapsed_time >=
       base::TimeDelta::FromMilliseconds(kMinTimeBetweenPrerendersMs);
 }