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This CL changes the way static library APK .build configs are
structured. Specifically:
  * JNI sources, Proguard flags, and Proguard classpath jars are
    combined from deps that use the static library
  * The .build_config contains a mapping of .build_config paths ->
    classpath for that target that can be used when dexsplitting

Bug: 901465
Change-Id: Ie83e071b3f6482cab594b3b0e735ad4ef8313bbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536306
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644316}