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This first patch allocates resource ids for the image structures in
blink. It then temporarily renames current usage of all these symbols
from IDR_* to IDR2_* so that we don't conflict on names once we land
part 2.

BUG=467176

Review URL: https://codereview.chromium.org/1030743002

Cr-Commit-Position: refs/heads/master@{#321913}