Disk cache: Don't evict entries if we are busy doing other stuff....

net/disk_cache/eviction.h

Index: net/disk_cache/eviction.h
===================================================================
--- net/disk_cache/eviction.h	(revision 20196)
+++ net/disk_cache/eviction.h	(working copy)
@@ -40,6 +40,8 @@
   void OnDestroyEntry(EntryImpl* entry);
 
  private:
+  void PostDelayedTrim();
+  void DelayedTrim();
   void ReportTrimTimes(EntryImpl* entry);
   Rankings::List GetListForEntry(EntryImpl* entry);
   bool EvictEntry(CacheRankingsBlock* node, bool empty);
@@ -68,6 +70,7 @@
   bool new_eviction_;
   bool first_trim_;
   bool trimming_;
+  bool delay_trim_;
   ScopedRunnableMethodFactory<Eviction> factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Eviction);