Add warning for non-c-typedef-for-linkage

This is blocking Skia from updating to newer clang

Tbr=cwallez@chromium.org
Bug: chromium:1064305
Change-Id: I7d894dba701ebe2fe0e1b78d5fb42032d88846aa
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/22522
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Mike Klein <mtklein@google.com>

src/common/BUILD.gn

diff --git a/src/common/BUILD.gn b/src/common/BUILD.gn
index 3f5a09b..244baeb 100644
--- a/src/common/BUILD.gn
+++ b/src/common/BUILD.gn
@@ -104,6 +104,7 @@
       "-Wshadow-field",
       "-Wstrict-prototypes",
       "-Wtautological-unsigned-zero-compare",
+      "-Wnon-c-typedef-for-linkage",
     ]
 
     if (is_win) {

src/include/dawn/dawn_wsi.h

diff --git a/src/include/dawn/dawn_wsi.h b/src/include/dawn/dawn_wsi.h
index e07e741..f1a6047 100644
--- a/src/include/dawn/dawn_wsi.h
+++ b/src/include/dawn/dawn_wsi.h
@@ -59,18 +59,18 @@
 } DawnSwapChainImplementation;
 
 #if defined(DAWN_ENABLE_BACKEND_D3D12) && defined(__cplusplus)
-typedef struct {
+struct DawnWSIContextD3D12 {
     WGPUDevice device = nullptr;
-} DawnWSIContextD3D12;
+};
 #endif
 
 #if defined(DAWN_ENABLE_BACKEND_METAL) && defined(__OBJC__)
 #    import <Metal/Metal.h>
 
-typedef struct {
+struct DawnWSIContextMetal {
     id<MTLDevice> device = nil;
     id<MTLCommandQueue> queue = nil;
-} DawnWSIContextMetal;
+};
 #endif
 
 #ifdef DAWN_ENABLE_BACKEND_OPENGL