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Change Android StackLayout to use ArrayLists for stacks instead of arrays

I have a series of CLs in progress to allow StackLayout to support more than two
tab stacks. This CL switches mStacks and mStackRects from arrays to ArrayLists
to better support StackLayout variants where the number of open tab stacks can
change.

Bug: 648314
Change-Id: I6604760395bc32612a53f1667d3d574c081ccd9c
Reviewed-on: https://chromium-review.googlesource.com/940523
Commit-Queue: Ryan Landay <rlanday@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540370}