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This involved:
1) Tweaking R8 to include the outer class name in the lambda name for
method references. This increases dex size by ~2kb, but is needed for
attribution (without this they all show in $APK).
2) Updating supersize to unmangle lambda names.

This patch also re-works how R8 local modifications are stored. It
changes from a single .patch file to multiple format-patch files.
This allows each patch to be applied separately (easier conflict
resolution), and allows a description to live right allon each patch
(via the commit messages)

Bug: 1032609
Change-Id: I34c356b542fd665e3b81f7a6d43e0e1dbbf38886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132668
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756136}