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Minimal test - lines (31, 95)

Code

nsresult nsDragServiceProxy::InvokeDragSessionImpl(
    nsIArray* aArrayTransferables, const Maybe& aRegion,
    uint32_t aActionType) {
  NS_ENSURE_STATE(mSourceDocument->GetDocShell());
  BrowserChild* child = BrowserChild::GetFrom(mSourceDocument->GetDocShell());
  NS_ENSURE_STATE(child);
  nsTArray dataTransfers;
  nsContentUtils::TransferablesToIPCTransferables(
      aArrayTransferables, dataTransfers, false, child->Manager(), nullptr);

  nsCOMPtr principal;
  if (mSourceNode) {
    principal = mSourceNode->NodePrincipal();
  }

  nsCOMPtr csp;
  if (mSourceDocument) {
    csp = mSourceDocument->GetCsp();
  }

  nsCOMPtr cookieJarSettings;
  cookieJarSettings = mSourceDocument->CookieJarSettings();
  net::CookieJarSettingsArgs csArgs;
  net::CookieJarSettings::Cast(cookieJarSettings)->Serialize(csArgs);

  LayoutDeviceIntRect dragRect;
  if (mHasImage || mSelection) {
    nsPresContext* pc;
    RefPtr surface;
    DrawDrag(mSourceNode, aRegion, mScreenPosition, &dragRect, &surface, &pc);

    if (surface) {
      RefPtr dataSurface = surface->GetDataSurface();
      if (dataSurface) {
        size_t length;
        int32_t stride;
        Maybe maybeShm = nsContentUtils::GetSurfaceData(
            dataSurface, &length, &stride, child);
        if (maybeShm.isNothing()) {
          return NS_ERROR_FAILURE;
        }

        auto surfaceData = maybeShm.value();

        // Save the surface data to shared memory.
        if (!surfaceData.IsReadable() || !surfaceData.get()) {
          NS_WARNING("Failed to create shared memory for drag session.");
          return NS_ERROR_FAILURE;
        }

        mozilla::Unused << child->SendInvokeDragSession(
            dataTransfers, aActionType, Some(std::move(surfaceData)), stride,
            dataSurface->GetFormat(), dragRect, principal, csp, csArgs);
        StartDragSession();
        return NS_OK;
      }
    }
  }

  mozilla::Unused << child->SendInvokeDragSession(
      dataTransfers, aActionType, Nothing(), 0, static_cast(0),
      dragRect, principal, csp, csArgs);
  StartDragSession();
  return NS_OK;
}