Add missing include in the Vulkan backend.

BUG=dawn:225

Change-Id: I8dc0c5c884d8130b98a849e0d675e29d80aa4de8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11303
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
diff --git a/src/dawn_native/vulkan/CommandRecordingContext.h b/src/dawn_native/vulkan/CommandRecordingContext.h
index 025de69..9bf81d4 100644
--- a/src/dawn_native/vulkan/CommandRecordingContext.h
+++ b/src/dawn_native/vulkan/CommandRecordingContext.h
@@ -16,6 +16,8 @@
 
 #include "common/vulkan_platform.h"
 
+#include "dawn_native/vulkan/BufferVk.h"
+
 #include <vector>
 
 namespace dawn_native { namespace vulkan {