Add browser_test to check that NaCl is logging UMA samples correctly.

ppapi/native_client/src/trusted/plugin/plugin_error.h

 /*
  * Copyright (c) 2011 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.
  */
 
 /*
  * Error codes and data structures used to report errors when loading a nexe.
  */
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_ERROR_H
 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_ERROR_H
 
 #include <string>
 
+#include "native_client/src/include/nacl_macros.h"
+
 namespace plugin {
 
 // These error codes are reported via UMA so, if you edit them:
 // 1) make sure you understand UMA, first.
 // 2) update src/tools/histograms/histograms.xml in
 //  svn://svn.chromium.org/chrome-internal/trunk/src-internal
 // Values are explicitly specified to make sure they don't shift around when
 // edited, and also to make reading about:histograms easier.
 enum PluginErrorCode {
   ERROR_LOAD_SUCCESS = 0,
@@ skipping 68 matching lines @@
 
  private:
   PluginErrorCode error_code_;
   std::string message_;
   NACL_DISALLOW_COPY_AND_ASSIGN(ErrorInfo);
 };
 
 }  // namespace plugin
 
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_ERROR_H