Use Chromium BUILD to approximate Blimp protocol version, and check it.

blimp/common/version_info.h

Index: blimp/common/version_info.h
diff --git a/blimp/common/version_info.h b/blimp/common/version_info.h
new file mode 100644
index 0000000000000000000000000000000000000000..e8149243ecc92a4ae86d81256c481d49e0fee77c
--- /dev/null
+++ b/blimp/common/version_info.h
@@ -0,0 +1,22 @@
+// Copyright 2015 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.
+
+#ifndef BLIMP_COMMON_VERSION_INFO_H_
+#define BLIMP_COMMON_VERSION_INFO_H_
+
+#include <string>
+
+#include "blimp/common/blimp_common_export.h"
+
+namespace blimp {
+
+// Latest version of the protocol supported by this build.
+int BLIMP_COMMON_EXPORT GetProtocolVersion();
+
+// String containing the MAJOR.MINOR.BUILD.PATCH version of this build.
+std::string BLIMP_COMMON_EXPORT GetBuildVersion();

[Kevin M, 2016/05/25 21:19:19]

Return a const char*?

[Wez, 2016/05/25 23:11:36]

I followed the style of version_info::GetVersionNumber() and friends, which all
return std::string.

But yeah, changed to const char* here.

+
+}  // namespace blimp
+
+#endif  // BLIMP_COMMON_VERSION_INFO_H_