Make three simultanious prerenders the default maximum in Canary and Dev only.

chrome/browser/prerender/prerender_config.h

Index: chrome/browser/prerender/prerender_config.h
diff --git a/chrome/browser/prerender/prerender_config.h b/chrome/browser/prerender/prerender_config.h
index 04f244b3e184bb849296e8533576b19d9d421336..a8a2990a2dc57a5ea63797149fab86e181eb3839 100644
--- a/chrome/browser/prerender/prerender_config.h
+++ b/chrome/browser/prerender/prerender_config.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_CONFIG_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_CONFIG_H_
 
+#include <string>

[dominich, 2012/07/19 16:04:38]

wat?

[gavinp, 2012/07/23 18:35:21]

This is a cleanup to make this file pass lint. See user_agent_override below.

+
 #include "base/time.h"
 #include "ui/gfx/rect.h"
 
@@ -17,7 +19,8 @@ struct Config {
   size_t max_bytes;
 
   // Number of simultaneous prendered pages allowed.
-  unsigned int max_elements;
+  static const int kDefaultMaxConcurrency = 2;

[dominich, 2012/07/19 16:04:38]

this doesn't need to be in the header.

[gavinp, 2012/07/23 18:35:21]

It's used in prerender_histograms.cc though. What do you suggest for sizing the
histogram? I renamed it to kMaximumMaxConcurrency, since the default is now 1.

+  unsigned int max_concurrency;

[dominich, 2012/07/19 16:04:38]

unsigned int, but the default is int? Sure, if someone sets the default to
negative we'll probably catch that in review, but why not make it consistent?

[gavinp, 2012/07/23 18:35:21]

Done.

 
   // Is rate limiting enabled?
   bool rate_limit_enabled;