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This sends request to ARC Android to set dalvik memory params based on
device's memory config.

BUG=b:160760318
TEST=unit test added
     Locally on device, early tests show improvements in app loading and
     ARC boot time up to 5%. This feature is currently optional and is
     behind Chrome feature. Next data will be collected on real user
     using finch experiment and in-lab tests by adding separate testing
     variation for few reference boards that activates this feature.

Change-Id: Iacb1a8c6ce874fe74152204a2e41a35bb2fa9da8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570552Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Yury Khmel <khmel@google.com>
Cr-Commit-Position: refs/heads/master@{#833154}