Made IndexedDB's comparators public.

content/browser/indexed_db/leveldb/leveldb_database.h

Index: content/browser/indexed_db/leveldb/leveldb_database.h
diff --git a/content/browser/indexed_db/leveldb/leveldb_database.h b/content/browser/indexed_db/leveldb/leveldb_database.h
index d2f08697ee402a28a697f9e1bfbdbde485afc159..27ffcd54db72f81fd14b2dec2134ad871565a4cd 100644
--- a/content/browser/indexed_db/leveldb/leveldb_database.h
+++ b/content/browser/indexed_db/leveldb/leveldb_database.h
@@ -12,6 +12,7 @@
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
 #include "content/common/content_export.h"
+#include "third_party/leveldatabase/src/include/leveldb/comparator.h"
 #include "third_party/leveldatabase/src/include/leveldb/status.h"
 
 namespace leveldb {
@@ -47,6 +48,24 @@ public:
 
 class CONTENT_EXPORT LevelDBDatabase {
  public:
+  class ComparatorAdapter : public leveldb::Comparator {
+   public:
+    explicit ComparatorAdapter(const LevelDBComparator* comparator);
+
+    virtual int Compare(const leveldb::Slice& a,
+                        const leveldb::Slice& b) const OVERRIDE;
+
+    virtual const char* Name() const OVERRIDE;
+
+    virtual void FindShortestSeparator(std::string* start,
+                                       const leveldb::Slice& limit) const
+        OVERRIDE;
+    virtual void FindShortSuccessor(std::string* key) const OVERRIDE;
+
+   private:
+    const LevelDBComparator* comparator_;
+  };
+
   static leveldb::Status Open(const base::FilePath& file_name,
                               const LevelDBComparator* comparator,
                               scoped_ptr<LevelDBDatabase>* db,