Tracing V2: Import support for protobuf plugin.

components/tracing/test/example_proto/various_messages.proto

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 syntax = "proto2";
 package foo.bar;
 
+import "library.proto";
+
 // This file contains comprehensive set of supported message structures and
 // data types. Unit tests depends on the plugin-processed version of this file.
 
+// Tests importing message definition frm another proto file.

[Primiano Tucci (use gerrit), 2016/08/03 15:36:28]

s/frm/from/

+message TransgalacticParcel {
+  optional TransgalacticMessage message = 1;
+  optional string tracking_code = 2;
+}
+
 enum SmallEnum {
   TO_BE = 1;
   NOT_TO_BE = 0;
 }
 
 enum SignedEnum {
   POSITIVE = 1;
   NEUTRAL = 0;
   NEGATIVE = -1;
 }
@@ skipping 36 matching lines @@
 
 message NestedA {
   message NestedB {
     message NestedC {
       optional int32 value_c = 1;
     }
     optional NestedC value_b = 1;
   }
   repeated NestedB repeated_a = 2;
 }