message: Fix another -Wc++11-narrowing on ChromeOS
diff: @@ -786,12 +786,12 @@ namespace dawn_native { namespace vulkan {
  WrapVulkanImage(secondDevice, &descriptor, fd, stride, modifier, {});
  // Draw a non-trivial picture
  - int width = 640, height = 480, pixelSize = 4;
  + uint32_t width = 640, height = 480, pixelSize = 4;
  uint32_t rowPitch = Align(width * pixelSize, kTextureRowPitchAlignment);
  uint32_t size = rowPitch * (height - 1) + width * pixelSize;
  unsigned char data[size];
  - for (int row = 0; row < height; row++) {
  - for (int col = 0; col < width; col++) {
  + for (uint32_t row = 0; row < height; row++) {
  + for (uint32_t col = 0; col < width; col++) {
  float normRow = static_cast<float>(row) / height;
  float normCol = static_cast<float>(col) / width;
  float dist = sqrt(normRow * normRow + normCol * normCol) * 3;
  