Merge "Understand the support library/androidx @Keep annotations" am: 3f6483cb0f am: d4ada79abd

am: 2172041a44

Change-Id: I5a72c50d7ef89cf8f4a4130b2fa13e1b6f297f03

core/proguard.flags

@@ -15,4 +15,35 @@
 @**.VisibleForTesting *;
 }
 
+# Understand the @Keep support annotation.
+-keep class android.support.annotation.Keep
+-keep class androidx.annotation.Keep
+
+-keep @android.support.annotation.Keep class * {*;}
+-keep @androidx.annotation.Keep class * {*;}
+
+-keepclasseswithmembers class * {
+    @android.support.annotation.Keep <methods>;
+}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <methods>;
+}
+
+-keepclasseswithmembers class * {
+    @android.support.annotation.Keep <fields>;
+}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <fields>;
+}
+
+-keepclasseswithmembers class * {
+    @android.support.annotation.Keep <init>(...);
+}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <init>(...);
+}
+
 -include proguard_basic_keeps.flags