Fix some misc-include-cleaner clang-tidy warnings

Change-Id: I6cc911776ac32bd9957ebea9130354bd1596fd0c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/181002
Auto-Submit: David Neto <dneto@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
diff --git a/src/tint/lang/wgsl/writer/writer_test.cc b/src/tint/lang/wgsl/writer/writer_test.cc
index 96bd0a4..d01d1df 100644
--- a/src/tint/lang/wgsl/writer/writer_test.cc
+++ b/src/tint/lang/wgsl/writer/writer_test.cc
@@ -27,12 +27,17 @@
 
 #include "src/tint/lang/wgsl/writer/writer.h"
 
+#include <ostream>
 #include <string>
+#include <string_view>
 
+#include "gtest/gtest.h"
 #include "src/tint/lang/core/ir/disassembler.h"
 #include "src/tint/lang/core/ir/ir_helper_test.h"
 #include "src/tint/lang/wgsl/writer/ir_to_program/ir_to_program.h"
+#include "src/tint/lang/wgsl/writer/ir_to_program/program_options.h"
 #include "src/tint/lang/wgsl/writer/raise/raise.h"
+#include "src/tint/utils/result/result.h"
 #include "src/tint/utils/text/string.h"
 
 namespace tint::wgsl::writer {
diff --git a/src/tint/utils/diagnostic/source_test.cc b/src/tint/utils/diagnostic/source_test.cc
index 42b4e01..b15eafb 100644
--- a/src/tint/utils/diagnostic/source_test.cc
+++ b/src/tint/utils/diagnostic/source_test.cc
@@ -27,6 +27,7 @@
 
 #include "src/tint/utils/diagnostic/source.h"
 
+#include <cstddef>
 #include <memory>
 #include <string_view>
 #include <utility>