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Added flag for aapt2 link to generate proguard conditional keep rules.

Bug: 682786
Change-Id: I11e7afd5b540bcc6bc0f4bf54a8bd20c750fb0a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1723796
Commit-Queue: Harsh Patel <harshpa@google.com>
Reviewed-by: Sam Maier <smaier@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684463}