Commits on Jul 17, 2021

1. Export proguard specs from aar_import …

   **Background**
   #3778
   
   proguard specs from the `aar_import` rule do not get bubbled up to `android_binary`. In this PR, I wire up a `ProguardSpecProvider` from this rule that exports the `proguard.txt` within an AAR if it exists and any transitive proguard specs from the `exports` attribute.
   
   **Changes**
   * Add an `aar_embedded_proguard_extractor` script to extract `proguard.txt` from an AAR if it exists otherwise generate an empty proguard specs file
   * In AarImport, wire up the proguard extractor action and export results through a `ProguardSpecProvider`.
   
   Once this lands, the android rules would need to be bumped.
   
   **Test Plan**
   * Added tests for the extraction python script
   * Added tests for the `aar_import` rule changes
   
   Closes #12749.
   
   PiperOrigin-RevId: 359667674

   

   benjaminRomano authored and cpsauer committed Jul 17, 2021
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