Save pipelining capabilities for the most used hosts between sessions.

base/memory/mru_cache.h

Index: base/memory/mru_cache.h
diff --git a/base/memory/mru_cache.h b/base/memory/mru_cache.h
index 434e5925e46bf92c3920cbb288eae55a92870ef8..6105c78a0e3c11651a86948f6b66d1340638697a 100644
--- a/base/memory/mru_cache.h
+++ b/base/memory/mru_cache.h
@@ -150,6 +150,15 @@ class MRUCacheBase {
     return reverse_iterator(Erase((++pos).base()));
   }
 
+  // Updates the |max_size_| of the cache to |new_max_size| and evicts entries,
+  // if necessary, to satisfy the new maximum.
+  void SetMaxSize(size_t new_max_size) {

[mmenke, 2011/12/06 15:50:38]

You're going to need a signoff from an owner of base to land this CL.  Even
without this added function, you still have the const iterator fixes.

[James Simonsen, 2011/12/06 19:57:49]

Yeah, Will's an owner and he's already given LGTM for the const changes.

+    if (new_max_size < max_size_) {
+      ShrinkToSize(new_max_size);
+    }
+    max_size_ = new_max_size;
+  }
+
   // Shrinks the cache so it only holds |new_size| items. If |new_size| is
   // bigger or equal to the current number of items, this will do nothing.
   void ShrinkToSize(size_type new_size) {
@@ -181,12 +190,12 @@ class MRUCacheBase {
   // can keep them as you insert or delete things (as long as you don't delete
   // the one you are pointing to) and they will still be valid.
   iterator begin() { return ordering_.begin(); }
-  const_iterator begin() const { ordering_.begin(); }
+  const_iterator begin() const { return ordering_.begin(); }
   iterator end() { return ordering_.end(); }
   const_iterator end() const { return ordering_.end(); }
 
   reverse_iterator rbegin() { return ordering_.rbegin(); }
-  const_reverse_iterator rbegin() const { ordering_.rbegin(); }
+  const_reverse_iterator rbegin() const { return ordering_.rbegin(); }
   reverse_iterator rend() { return ordering_.rend(); }
   const_reverse_iterator rend() const { return ordering_.rend(); }