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Previously, the plan was to re-use the low bits of the IconKey.u_key to
represent icon post-processing effects such as desaturation to gray.

On further thought, we would also like to apply such effects to IconKeys
that already use the u_key to represent a resource ID, and do not use an
IncrementingIconKeyFactory.

It is therefore clearer to have an explicit field for icon effects.

In this commit, this new field is always zero. A follow-up commit will
use non-zero values.

BUG=826982

Change-Id: I6453a648ed2608a2af59d0d01e1fe9bf4af5c90f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1505741Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638358}