skia: Add workaround header define

Chromium-side changes for:
https://skia-review.googlesource.com/c/skia/+/120608

Bug: 829614
Change-Id: I59dc05ae1d66622ce3c771311ec3e1b64023b66f
Reviewed-on: https://chromium-review.googlesource.com/1008924Reviewed-by: Brian Salomon <bsalomon@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551370}

skia/BUILD.gn

@@ -68,6 +68,9 @@ config("skia_config") {
     ]
   }
 
+  workaround_header = "gpu/config/gpu_driver_bug_workaround_autogen.h"
+  defines += [ "SK_GPU_WORKAROUNDS_HEADER=\"$workaround_header\"" ]
+
   if (is_component_build) {
     defines += [
       "SKIA_DLL",