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After Dx12/Vulkan Info collection task is delayed for 2 minutes (the other CL),
Dx12/Vulkan info will always be requested if the data is not available for
about:gpu.

Rewrite the code to make DxDiagNode function aligned with Dx12VulkanInfo
function.

Bug:949839

Change-Id: Ifcab4885dccb13e206f707657ac9074a21cdf4a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785827
Auto-Submit: Maggie Chen <magchen@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694960}