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Initialize SharedImageRepresentationFactory with non-null MemoryTracker from
SkiaOutputSurfaceImplOnGpu. Said tracker is a sub tracker of
SharedContextState::SharedImageMemoryTracker, which contributes to task manager
GPU Memory column and histograms Memory.GPU.PeakMemoryUsage.

TODO::The new memory tracker should also track SkiaRenderer GPU memory
allocations that are not shared image creations.

Bug: 899905
Change-Id: Idaddbddeba17361e0f4ad258d5bd4ad4b4c1509f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940559
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720257}