message: dawn: Fix GetExecutablePath for iOS.
diff: # include <limits.h>
  # include <unistd.h>
  # include <cstdlib>
  -#elif defined(DAWN_PLATFORM_MACOS)
  +#elif defined(DAWN_PLATFORM_MACOS) || defined(DAWN_PLATFORM_IOS)
  # include <mach-o/dyld.h>
  # include <vector>
  #endif
  @@ -88,7 +88,7 @@ std::string GetExecutablePath() {
  path[result] = '\0';
  return path.data();
  }
  -#elif defined(DAWN_PLATFORM_MACOS)
  +#elif defined(DAWN_PLATFORM_MACOS) || defined(DAWN_PLATFORM_IOS)
  std::string GetExecutablePath() {
  uint32_t size = 0;
  _NSGetExecutablePath(nullptr, &size);
  