Pull cacheinvalidations code directory into chromium repo.

third_party/cacheinvalidation/src/google/cacheinvalidation/client_gateway.proto

Index: third_party/cacheinvalidation/src/google/cacheinvalidation/client_gateway.proto
diff --git a/third_party/cacheinvalidation/src/google/cacheinvalidation/client_gateway.proto b/third_party/cacheinvalidation/src/google/cacheinvalidation/client_gateway.proto
new file mode 100644
index 0000000000000000000000000000000000000000..5b12452f7be382d78b73af8ec45e38719064a32d
--- /dev/null
+++ b/third_party/cacheinvalidation/src/google/cacheinvalidation/client_gateway.proto
@@ -0,0 +1,38 @@
+// Copyright 2011 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.
+
+// Specification of invalidation gateway internal forwarding messages and
+// services.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package ipc.invalidation;
+
+// The message communicated between gateway and clients.
+message ClientGatewayMessage {
+  // Whether it is client to server or server to client.
+  optional bool is_client_to_server = 1;
+
+  // Serialized version of the ServiceContext.
+  optional bytes service_context = 2;
+
+  // Rpc scheduling hash.
+  optional int64 rpc_scheduling_hash = 3;
+
+  // Payload of the network message (ClientToServerMessage or
+  // ServerToClientMessage).
+  optional bytes network_message = 4;
+}