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..856d2ee97e160d8c44899abd2c48e2247e81b8a1 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -1533,6 +1533,8 @@ bool PrerenderManager::DoesRateLimitAllowPrerender(Origin origin) const {
   histograms_->RecordTimeBetweenPrerenderRequests(origin, elapsed_time);
   if (!config_.rate_limit_enabled)
     return true;
+  if (origin == ORIGIN_LOCAL_PREDICTOR)

[davidben, 2014/06/19 19:33:34]

Nit: Add a comment that ORIGIN_LOCAL_PREDICTOR may try to keep a set of
prerenders alive at once and so it shouldn't be throttled here. At first I
thought this was because you didn't want to throttle prefetches or something.

[tburkard, 2014/06/19 20:01:49]

Done.

+    return true;
   return elapsed_time >=
       base::TimeDelta::FromMilliseconds(kMinTimeBetweenPrerendersMs);
 }