Move InMemoryURLIndex Caching Operations to FILE Thread

chrome/browser/history/in_memory_url_index_types.cc

Index: chrome/browser/history/in_memory_url_index_types.cc
===================================================================
--- chrome/browser/history/in_memory_url_index_types.cc	(revision 125451)
+++ chrome/browser/history/in_memory_url_index_types.cc	(working copy)
@@ -147,4 +147,16 @@
   return prefixes.count(prefix) != 0;
 }
 
+// RefCountedBool --------------------------------------------------------------
+
+const unsigned char* RefCountedBool::front() const {
+  return reinterpret_cast<const unsigned char*>(&bool_);
+}
+
+size_t RefCountedBool::size() const {
+  return sizeof(bool_);
+}
+
+RefCountedBool::~RefCountedBool() {}
+
 }  // namespace history