Reland [inspector] add inspector protocol parser test build target.

test/inspector_protocol_parser_test/RunTests.cpp

+// Copyright 2016 the V8 project 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 "testing/gmock/include/gmock/gmock.h"
+
+namespace {
+
+class InspectorProtocolTestEnvironment final : public ::testing::Environment {};
+
+}  // namespace
+
+int main(int argc, char** argv) {
+  testing::InitGoogleMock(&argc, argv);
+  testing::AddGlobalTestEnvironment(new InspectorProtocolTestEnvironment);
+  return RUN_ALL_TESTS();
+}