Change multi-prerender API to include per launcher slots.

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 62e23408fc8dd1e0bd466d084f36a91798b30deb..2c833ffbb50115a63f0df5707b27166d8fe4f5e2 100644
--- a/chrome/browser/prerender/prerender_config.h
+++ b/chrome/browser/prerender/prerender_config.h
@@ -19,9 +19,12 @@ struct Config {
   // Maximum memory use for a prerendered page until it is killed.
   size_t max_bytes;
 
-  // Number of simultaneous prendered pages allowed.
+  // Number of simultaneous prerendered pages allowed.

[mmenke, 2012/12/18 17:15:15]

This is no longer correct.  Suggest something like "Number of simultaneous
prerender pages from link elements allowed.  Enforced by PrerenderLinkManager."

[gavinp, 2012/12/18 20:15:12]

Done.

   size_t max_concurrency;

[mmenke, 2012/12/18 17:15:15]

|max_link_concurrency|?

[gavinp, 2012/12/18 20:15:12]

Done.

 
+  // Number of simultaneous prerendered pages allowed per launcher.
+  size_t max_concurrency_per_launcher;
+
   // Is rate limiting enabled?
   bool rate_limit_enabled;