Fix building with system libvpx

Disable code path which depends on internal api.
According to the upstream change it is only needed
for logging. See https://crrev.com/c/chromium/src/+/5116580

Fixes: QTBUG-129955
Change-Id: I5f396fcd8b22402af71a9e557f9f2f7f177a8114
Reviewed-on: https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/617894
Reviewed-by: Allan Sandfeld Jensen <[email protected]>
Reviewed-by: Moss Heim <[email protected]>
(cherry picked from commit 30e6fcc)
Reviewed-on: https://codereview.qt-project.org/c/qt/qtwebengine-chromium/+/621129
Reviewed-by: Qt Cherry-pick Bot <[email protected]>

Author: mnegyokru

chromium/media/base/libvpx_thread_wrapper.cc

@@ -5,18 +5,22 @@
 #include "media/base/libvpx_thread_wrapper.h"
 
 #include "media/base/codec_worker_impl.h"
+#if !BUILDFLAG(IS_QTWEBENGINE) || !defined(USE_SYSTEM_LIBVPX)
 #include "third_party/libvpx/source/libvpx/vpx_util/vpx_thread.h"
+#endif
 
 namespace media {
 
 void InitLibVpxThreadWrapper() {
+#if !BUILDFLAG(IS_QTWEBENGINE) || !defined(USE_SYSTEM_LIBVPX)
   const VPxWorkerInterface interface =
       CodecWorkerImpl<VPxWorkerInterface, VPxWorkerImpl, VPxWorker,
                       VPxWorkerStatus, VPX_WORKER_STATUS_NOT_OK,
                       VPX_WORKER_STATUS_OK,
                       VPX_WORKER_STATUS_WORKING>::GetCodecWorkerInterface();
 
   CHECK(vpx_set_worker_interface(&interface));
+#endif
 }
 
 }  // namespace media

chromium/third_party/libvpx/BUILD.gn

@@ -634,6 +634,7 @@ static_library("bundled_libvpxrc") {
 if (use_system_libvpx) {
   pkg_config("system_libvpx") {
     packages = [ "vpx" ]
+    defines = ["USE_SYSTEM_LIBVPX=true"]
   }
 }