message: Append the stack trace to the error message
  This makes it much easier to understand where errors come from.
diff: @@ -210,7 +210,13 @@ namespace dawn_native {
  void DeviceBase::ConsumeError(std::unique_ptr<ErrorData> error) {
  ASSERT(error != nullptr);
  - HandleError(error->GetType(), error->GetMessage().c_str());
  + std::ostringstream ss;
  + ss << error->GetMessage();
  + for (const auto& callsite : error->GetBacktrace()) {
  + ss << "\n at " << callsite.function << " (" << callsite.file << ":" << callsite.line
  + << ")";
  + }
  + HandleError(error->GetType(), ss.str().c_str());
  }
  void DeviceBase::SetUncapturedErrorCallback(wgpu::ErrorCallback callback, void* userdata) {
  