Pull cacheinvalidations code directory into chromium repo.

third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.h

Index: third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.h
diff --git a/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.h b/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..8adb3167a9b8c41dce38eb260fcf1e23f957d21b
--- /dev/null
+++ b/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.h
@@ -0,0 +1,49 @@
+// Copyright 2012 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Digest-related utilities for object ids.
+
+#ifndef GOOGLE_CACHEINVALIDATION_IMPL_OBJECT_ID_DIGEST_UTILS_H_
+#define GOOGLE_CACHEINVALIDATION_IMPL_OBJECT_ID_DIGEST_UTILS_H_
+
+#include <map>
+
+#include "google/cacheinvalidation/deps/digest-function.h"
+#include "google/cacheinvalidation/impl/client-protocol-namespace-fix.h"
+
+namespace invalidation {
+
+using INVALIDATION_STL_NAMESPACE::map;
+
+class ObjectIdDigestUtils {
+ public:
+  /* Returns the digest of the set of keys in the given map. */
+  template<typename T>
+  static string GetDigest(
+      map<string, T> registrations, DigestFunction* digest_fn) {
+    digest_fn->Reset();
+    for (map<string, ObjectIdP>::iterator iter = registrations.begin();
+         iter != registrations.end(); ++iter) {
+      digest_fn->Update(iter->first);
+    }
+    return digest_fn->GetDigest();
+  }
+
+  /* Returns the digest of object_id using digest_fn. */
+  static string GetDigest(
+      const ObjectIdP& object_id, DigestFunction* digest_fn);
+};
+}  // namespace invalidation
+
+#endif  // GOOGLE_CACHEINVALIDATION_IMPL_OBJECT_ID_DIGEST_UTILS_H_