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.*DrawQuad::OverlayResources::size_in pixels used to be a vector of 4.
Looking at the code, we always index the first one and we never use
the rest of the array.

This reduces the size of TextureDrawQuad that is the biggest
DrawQuad.
Since QuadList uses the size of the biggest DrawQuad to allocate any
quad, this CL will reduce the memory used by QuadList, even if
TextureDrawQuads are not used.

Change-Id: I554cb1b313519094a893cba6342ad47c15882827
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2058834Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Auto-Submit: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742259}