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Different VkImageUsageFlags may create VkImages with different
characteristics. glTexStorageMem2DEXTFn doesn't accept a usage flag
argument, instead the spec requires us to request all supported flags for
allocations that will alias GL textures.

This fixes ExternalVkImageFactory to comply this requirement. It's an
issue on ARM where VK_IMAGE_USAGE_STORAGE_BIT affects VkImage memory
requirements.

Bug: 1058958

Change-Id: I711f8463f709e9c77811325e004018c87bcd0626
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090454Reviewed-by: Peng Huang <penghuang@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747826}