message: MSC build fix.
  MSC doesn't like the use of sizeof(member) inside the same struct.
  So hardcode the padding, and assert that the offset is 256.
diff: // See the License for the specific language governing permissions and
  // limitations under the License.
  +#include "common/Assert.h"
  #include "common/Constants.h"
  #include "tests/DawnTest.h"
  #include "utils/DawnHelpers.h"
  @@ -124,9 +125,10 @@ TEST_P(BindGroupTests, ReusedUBO) {
  .GetResult();
  struct Data {
  float transform[8];
  - char padding[256 - sizeof(Data::transform)];
  + char padding[256 - 8 * sizeof(float)];
  float color[4];
  };
  + ASSERT(offsetof(Data, color) == 256);
  constexpr float dummy = 0.0f;
  Data data {
  { 1.f, 0.f, dummy, dummy, 0.f, 1.0f, dummy, dummy },
  @@ -135,9 +137,9 @@ TEST_P(BindGroupTests, ReusedUBO) {
  };
  dawn::Buffer buffer = utils::CreateBufferFromData(device, &data, sizeof(data), dawn::BufferUsageBit::Uniform);
  dawn::BufferView vertUBOBufferView =
  - buffer.CreateBufferViewBuilder().SetExtent(offsetof(Data, transform), sizeof(Data::transform)).GetResult();
  + buffer.CreateBufferViewBuilder().SetExtent(0, sizeof(Data::transform)).GetResult();
  dawn::BufferView fragUBOBufferView =
  - buffer.CreateBufferViewBuilder().SetExtent(offsetof(Data, color), sizeof(Data::color)).GetResult();
  + buffer.CreateBufferViewBuilder().SetExtent(256, sizeof(Data::color)).GetResult();
  dawn::BindGroup bindGroup = device.CreateBindGroupBuilder()
  .SetLayout(bgl)
  .SetBufferViews(0, 1, &vertUBOBufferView)
  