Mojo validation test input parser: disallow multiple [anchr]s with the same ID.

mojo/public/cpp/bindings/tests/validation_unittest.cc

 // Copyright 2014 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.
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 346 matching lines @@
     const char* error_inputs[] = {
       "/ hello world",
       "[u1]x",
       "[u2]-1000",
       "[u1]0x100",
       "[s2]-0x8001",
       "[b]1",
       "[b]1111111k",
       "[dist4]unmatched",
       "[anchr]hello [dist8]hello",
+      "[dist4]a [dist4]a [anchr]a",
+      "[dist4]a [anchr]a [dist4]a [anchr]a",
       "0 [handles]50",
       NULL
     };
 
     for (size_t i = 0; error_inputs[i]; ++i) {
       std::vector<uint8_t> expected;
       if (!TestInputParser(error_inputs[i], false, expected, 0))
         ADD_FAILURE() << "Unexpected test result for: " << error_inputs[i];
     }
   }
@@ skipping 35 matching lines @@
   IntegrationTestInterface1Impl* interface1_impl =
       BindToPipe(new IntegrationTestInterface1Impl(), testee_endpoint().Pass());
   interface1_impl->internal_state()->router()->EnableTestingMode();
 
   RunValidationTests("integration_", test_message_receiver());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo