Pull cacheinvalidations code directory into chromium repo.

third_party/cacheinvalidation/src/google/cacheinvalidation/deps/digest-function.h

Index: third_party/cacheinvalidation/src/google/cacheinvalidation/deps/digest-function.h
diff --git a/third_party/cacheinvalidation/src/google/cacheinvalidation/deps/digest-function.h b/third_party/cacheinvalidation/src/google/cacheinvalidation/deps/digest-function.h
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index 0000000000000000000000000000000000000000..6e00f5ba5aa471b3ac627281a11de400f00e2311
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+++ b/third_party/cacheinvalidation/src/google/cacheinvalidation/deps/digest-function.h
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+// 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.
+
+// Interface specifying a function to compute digests.
+
+#ifndef GOOGLE_CACHEINVALIDATION_DEPS_DIGEST_FUNCTION_H_
+#define GOOGLE_CACHEINVALIDATION_DEPS_DIGEST_FUNCTION_H_
+
+#include <string>
+
+#include "google/cacheinvalidation/deps/stl-namespace.h"
+
+namespace invalidation {
+
+using INVALIDATION_STL_NAMESPACE::string;
+
+class DigestFunction {
+ public:
+  virtual ~DigestFunction() {}
+
+  /* Clears the digest state. */
+  virtual void Reset() = 0;
+
+  /* Adds data to the digest being computed. */
+  virtual void Update(const string& data) = 0;
+
+  /* Stores the digest of the data added by Update. After this call has been
+   * made, reset must be called before Update and GetDigest can be called.
+   */
+  virtual string GetDigest() = 0;
+};
+
+}  // namespace invalidation
+
+#endif  // GOOGLE_CACHEINVALIDATION_DEPS_DIGEST_FUNCTION_H_