Commits on Feb 7, 2022

1. Enable r8 support in bazel …

   This cl introduces R8 support in Bazel for proguarding and dexing.
   R8 is enabled by passing --experimental_enable_r8=true to the
   blaze build invocation and --proguard_top="//bzl/r8:proguard_compat"
   
   When enabled the build graph was changed from
    - jar -> proguard -> dex -> apk
   To
    - jar -> r8 -> apk
   
    I.e R8 takes care of proguarding and dexing.
   
   There are a few known limitations:
   
    - Only native multidex (Android version L+) is supported.
      All android_binary targets declare native_multidex so it does not
      make sense to implement legacy multidex with R8
    - Mobile-Install is not supported: mobile-install relies on how dexes
      are shard. R8 dexes the deploy jar in a single monolithic action
      which is cant be done incrementally (I don't think mobile-install is
      supported anymore)
    - Other features which are not implemented in bazel at the moment:
      e.g. dynamic delivery
    - proguard_compat needs to be available (not in this commit)
   
   ---
   Automatic squash commit from https://github.sc-corp.net/Snapchat/bazel/pull/145
   Cooled by mgalindo

   

   mgalindo-sc committed Feb 7, 2022
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