Do conservative prerendering based on the LocalPredictor in Dev/Canary.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
===================================================================
--- chrome/common/chrome_switches.cc	(revision 198752)
+++ chrome/common/chrome_switches.cc	(working copy)
@@ -360,6 +360,10 @@
 // Disable speculative TCP/IP preconnection.
 const char kDisablePreconnect[]             = "disable-preconnect";
 
+// Disable prerendering based on local browsing history.
+const char kDisablePrerenderLocalPredictor[] =
+    "disable-prerender-local-predictor";
+
 // Normally when the user attempts to navigate to a page that was the result of
 // a post we prompt to make sure they want to. This switch may be used to
 // disable that check. This switch is used during automated testing.