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Both gpu/shared-images/* and gpu/shared_images/* are used as the memory
dump name for shared images. Other GPU code uses an underscore in dump
names so use gpu/shared_images.

Bug: none
Change-Id: I03466b6ca43cd4d35e5227804d7de1125b3ac865
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894465
Auto-Submit: kylechar <kylechar@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711925}