Add a missing include for int32_t

Bug: 40263312
Change-Id: I67e90944c0878106fbe1ebf84e62dbd93056d042
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/248854
Auto-Submit: Takuto Ikuta <tikuta@google.com>
Commit-Queue: Fr <beaufort.francois@gmail.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Fr <beaufort.francois@gmail.com>

src/dawn/common/SystemUtils.h

diff --git a/src/dawn/common/SystemUtils.h b/src/dawn/common/SystemUtils.h
index 8afe39b..947d16f 100644
--- a/src/dawn/common/SystemUtils.h
+++ b/src/dawn/common/SystemUtils.h
@@ -28,6 +28,7 @@
 #ifndef SRC_DAWN_COMMON_SYSTEMUTILS_H_
 #define SRC_DAWN_COMMON_SYSTEMUTILS_H_
 
+#include <cstdint>
 #include <optional>
 #include <string>
 #include <utility>