[dawn][d3d12] Fix names in PIX function signatures

Based on Brandon's testing, this is correct, just the parameter name is
wrong.

Bug: 526533386
Change-Id: Iaa5dbba96b6d7230ef0b06cf34f9dee00ddf44b5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/324895
Auto-Submit: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>

src/dawn/native/d3d12/PlatformFunctionsD3D12.h

diff --git a/src/dawn/native/d3d12/PlatformFunctionsD3D12.h b/src/dawn/native/d3d12/PlatformFunctionsD3D12.h
index 2ab70fb..e58e93a 100644
--- a/src/dawn/native/d3d12/PlatformFunctionsD3D12.h
+++ b/src/dawn/native/d3d12/PlatformFunctionsD3D12.h
@@ -70,20 +70,22 @@
     PFN_D3D11ON12_CREATE_DEVICE d3d11on12CreateDevice = nullptr;
 
     // Functions from WinPixEventRuntime.dll
+    //
+    // The only official reference for these function signatures is
+    // https://devblogs.microsoft.com/pix/winpixeventruntime/
+    // however it is incorrect: it says the third argument is a `formatString` like in PIXBeginEvent
+    // (implying it would have varargs, but it doesn't). It appears that PIX in fact treats it as a
+    // plain label, not a format string, so we've renamed it here.
+    using PFN_PIX_BEGIN_EVENT_ON_COMMAND_LIST =
+        HRESULT(WINAPI*)(ID3D12GraphicsCommandList* commandList, UINT64 color, _In_ PCSTR label);
     using PFN_PIX_END_EVENT_ON_COMMAND_LIST =
         HRESULT(WINAPI*)(ID3D12GraphicsCommandList* commandList);
-
-    PFN_PIX_END_EVENT_ON_COMMAND_LIST pixEndEventOnCommandList = nullptr;
-
-    using PFN_PIX_BEGIN_EVENT_ON_COMMAND_LIST = HRESULT(
-        WINAPI*)(ID3D12GraphicsCommandList* commandList, UINT64 color, _In_ PCSTR formatString);
-
-    PFN_PIX_BEGIN_EVENT_ON_COMMAND_LIST pixBeginEventOnCommandList = nullptr;
-
     using PFN_SET_MARKER_ON_COMMAND_LIST = HRESULT(WINAPI*)(ID3D12GraphicsCommandList* commandList,
                                                             UINT64 color,
-                                                            _In_ PCSTR formatString);
+                                                            _In_ PCSTR label);
 
+    PFN_PIX_BEGIN_EVENT_ON_COMMAND_LIST pixBeginEventOnCommandList = nullptr;
+    PFN_PIX_END_EVENT_ON_COMMAND_LIST pixEndEventOnCommandList = nullptr;
     PFN_SET_MARKER_ON_COMMAND_LIST pixSetMarkerOnCommandList = nullptr;
 
     // Functions from dxcompiler.dll