Android: Ignore proguard rules from META-INF

This change is necessary to roll downstream GMS Core, which includes new
proguard rules added via META-INF/proguard in
google_play_services_basement_java.

Change-Id: I0883ffe043a8dae267fa2e82757996e64cefd37f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503813Reviewed-by: Peter Wen <wnwen@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821410}

third_party/android_deps/buildSrc/src/main/groovy/BuildConfigGenerator.groovy

@@ -500,6 +500,8 @@ class BuildConfigGenerator extends DefaultTask {
                 sb.append('  ignore_proguard_configs = true\n')
                 break
             case 'com_google_android_gms_play_services_basement':
+                sb.append('  # https://crbug.com/989505\n')
+                sb.append('  jar_excluded_patterns = ["META-INF/proguard/*"]\n')
                 // Deprecated deps jar but still needed by play services basement.
                 sb.append('  input_jars_paths=["\\$android_sdk/optional/org.apache.http.legacy.jar"]\n')
                 break