pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/config/proguard/play-services-keeps.cfg

@@ -0,0 +1,19 @@
+# Rules to prevent Google Play Services from exploding
+# (From http://developer.android.com/google/play-services/setup.html#Proguard
+# With the reference to "Object" changed so it'll actually *work*...)
+-keep class * extends java.util.ListResourceBundle {
+    protected java.lang.Object[][] getContents();
+}
+
+-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
+    public static final *** NULL;
+}
+
+-keepnames @com.google.android.gms.common.annotation.KeepName class *
+-keepclassmembernames class * {
+    @com.google.android.gms.common.annotation.KeepName *;
+}
+
+-keepnames class * implements android.os.Parcelable {
+    public static final ** CREATOR;
+}