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BaseGmsClient provides the methods required for its subclass GmsClient
to correctly implement Api$Client. Those methods appear to be removed by
R8, leading to an AbstractMethodError calling dump.

Mark all the methods that are currently kept in the interface as -keep
in proguard configs.

Bug: 1002847
Test: Decompile to verify methods not removed.
Test: Manually verify that crbug/1002847 no longer reproduces
Change-Id: I22b0610bdb49df40645517c0d428a587c3d1563f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1805655
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696865}