Validate MessageHeader before using

mojo/mojo_public.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_system',
       'type': 'static_library',
       'defines': [
         'MOJO_SYSTEM_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
@@ skipping 89 matching lines @@
     },
     {
       'target_name': 'mojo_public_test_utils',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../testing/gtest.gyp:gtest',
         'mojo_test_support',
       ],
       'sources': [
+        'public/cpp/test_support/lib/test_support.cc',
         'public/cpp/test_support/lib/test_utils.cc',
         'public/cpp/test_support/test_utils.h',
       ],
     },
     # TODO(vtl): Reorganize the mojo_public_*_unittests.
     {
       'target_name': 'mojo_public_bindings_unittests',
       'type': 'executable',
       'dependencies': [
         '../testing/gtest.gyp:gtest',
         'mojo_cpp_bindings',
         'mojo_environment_standalone',
         'mojo_public_test_utils',
         'mojo_run_all_unittests',
         'mojo_public_test_interfaces',
         'mojo_utility',
       ],
       'sources': [
         'public/cpp/bindings/tests/array_unittest.cc',
         'public/cpp/bindings/tests/buffer_unittest.cc',
         'public/cpp/bindings/tests/connector_unittest.cc',
         'public/cpp/bindings/tests/handle_passing_unittest.cc',
         'public/cpp/bindings/tests/remote_ptr_unittest.cc',
         'public/cpp/bindings/tests/request_response_unittest.cc',
         'public/cpp/bindings/tests/router_unittest.cc',
         'public/cpp/bindings/tests/sample_service_unittest.cc',
         'public/cpp/bindings/tests/type_conversion_unittest.cc',
+        'public/cpp/bindings/tests/validation_unittest.cc',
       ],
     },
     {
       'target_name': 'mojo_public_environment_unittests',
       'type': 'executable',
       'dependencies': [
         '../base/base.gyp:base',
         '../testing/gtest.gyp:gtest',
         'mojo_environment_standalone',
         'mojo_public_test_utils',
@@ skipping 89 matching lines @@
         'public/cpp/bindings/lib/buffer.cc',
         'public/cpp/bindings/lib/callback_internal.h',
         'public/cpp/bindings/lib/connector.cc',
         'public/cpp/bindings/lib/connector.h',
         'public/cpp/bindings/lib/fixed_buffer.cc',
         'public/cpp/bindings/lib/fixed_buffer.h',
         'public/cpp/bindings/lib/interface.cc',
         'public/cpp/bindings/lib/message.cc',
         'public/cpp/bindings/lib/message_builder.cc',
         'public/cpp/bindings/lib/message_builder.h',
+        'public/cpp/bindings/lib/message_header_validator.cc',
+        'public/cpp/bindings/lib/message_header_validator.h',
         'public/cpp/bindings/lib/message_internal.h',
         'public/cpp/bindings/lib/message_queue.cc',
         'public/cpp/bindings/lib/message_queue.h',
         'public/cpp/bindings/lib/router.cc',
         'public/cpp/bindings/lib/router.h',
         'public/cpp/bindings/lib/scratch_buffer.cc',
         'public/cpp/bindings/lib/scratch_buffer.h',
         'public/cpp/bindings/lib/shared_data.h',
         'public/cpp/bindings/lib/shared_ptr.h',
         'public/cpp/bindings/lib/sync_dispatcher.cc',
@@ skipping 121 matching lines @@
           'type': 'none',
           'variables': {
             'java_in_dir': 'public/java',
           },
           'includes': [ '../build/java.gypi' ],
         },
       ],
     }],
   ],
 }