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diff --git a/chromium/third_party/cld_3/src/src/feature_extractor.proto b/chromium/third_party/cld_3/src/src/feature_extractor.proto
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+++ b/chromium/third_party/cld_3/src/src/feature_extractor.proto
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+/* Copyright 2016 Google Inc. All Rights Reserved.
+
+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.
+==============================================================================*/
+
+// Protocol buffers for feature extractor.
+
+syntax = "proto2";
+option optimize_for = LITE_RUNTIME;
+
+package chrome_lang_id;
+
+message Parameter {
+  optional string name = 1;
+  optional string value = 2;
+}
+
+// Descriptor for feature function.
+message FeatureFunctionDescriptor {
+  // Feature function type.
+  required string type = 1;
+
+  // Feature function name.
+  optional string name = 2;
+
+  // Default argument for feature function.
+  optional int32 argument = 3 [default = 0];
+
+  // Named parameters for feature descriptor.
+  repeated Parameter parameter = 4;
+
+  // Nested sub-feature function descriptors.
+  repeated FeatureFunctionDescriptor feature = 7;
+};
+
+// Descriptor for feature extractor.
+message FeatureExtractorDescriptor {
+  // Top-level feature function for extractor.
+  repeated FeatureFunctionDescriptor feature = 1;
+};