Pull cacheinvalidations code directory into chromium repo.

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

Index: third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.cc
diff --git a/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.cc b/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..182e9cad3e8adb5c6d7f2e82973c718c938f4d5a
--- /dev/null
+++ b/third_party/cacheinvalidation/src/google/cacheinvalidation/impl/object-id-digest-utils.cc
@@ -0,0 +1,38 @@
+// 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.
+
+#include "google/cacheinvalidation/impl/object-id-digest-utils.h"
+
+namespace invalidation {
+
+string ObjectIdDigestUtils::GetDigest(
+    const ObjectIdP& object_id, DigestFunction* digest_fn) {
+  digest_fn->Reset();
+  int source = object_id.source();
+  string buffer(4, 0);
+
+  // Little endian number for type followed by bytes.
+  buffer[0] = source & 0xff;
+  buffer[1] = (source >> 8) & 0xff;
+  buffer[2] = (source >> 16) & 0xff;
+  buffer[3] = (source >> 24) & 0xff;
+
+  digest_fn->Update(buffer);
+  digest_fn->Update(object_id.name());
+  return digest_fn->GetDigest();
+}
+
+}  // namespace invalidation