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

mobile/android/config/proguard/proguard.cfg

@@ -0,0 +1,185 @@
+# Dalvik renders preverification unuseful (Would just slightly bloat the file).
+-dontpreverify
+
+# Uncomment to have Proguard list dead code detected during the run - useful for cleaning up the codebase.
+# -printusage
+
+-dontskipnonpubliclibraryclassmembers
+-verbose
+-allowaccessmodification
+
+# Preserve all fundamental application classes.
+-keep public class * extends android.app.Activity
+-keep public class * extends android.app.Application
+-keep public class * extends android.app.Service
+-keep public class * extends android.app.backup.BackupAgentHelper
+-keep public class * extends android.content.BroadcastReceiver
+-keep public class * extends android.content.ContentProvider
+-keep public class * extends android.preference.Preference
+-keep public class * extends org.mozilla.gecko.fxa.sync.FxAccountSyncAdapter
+-keep class org.mozilla.gecko.fxa.sync.FxAccountSyncAdapter
+
+-keep public class * extends android.support.v4.app.Fragment
+
+# Preserve all native method names and the names of their classes.
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+}
+
+-keepclassmembers class * extends android.app.Activity {
+   public void *(android.view.View);
+}
+
+
+# Keep setters in Views so that animations can still work.
+# See http://proguard.sourceforge.net/manual/examples.html#beans
+# From tools/proguard/proguard-android.txt.
+-keepclassmembers public class * extends android.view.View {
+   void set*(***);
+   *** get*();
+}
+
+# Keep setters in support Fragment so that Robocop tests work,
+# specifically testBrowserSearchVisibility.
+-keepclassmembers public class * extends android.support.v4.app.Fragment {
+   void set*(***);
+   *** get*();
+}
+
+# Preserve enums. (For awful reasons, the runtime accesses them using introspection...)
+-keepclassmembers enum * {
+     *;
+}
+
+#
+# Rules from ProGuard's Android example:
+# http://proguard.sourceforge.net/manual/examples.html#androidapplication
+#
+
+# Keep a fixed source file attribute and all line number tables to get line
+# numbers in the stack traces.
+# You can comment this out if you're not interested in stack traces.
+
+-renamesourcefileattribute SourceFile
+-keepattributes SourceFile,LineNumberTable
+
+# RemoteViews might need annotations.
+
+-keepattributes *Annotation*
+
+# Preserve all View implementations, their special context constructors, and
+# their setters.
+
+-keep public class * extends android.view.View {
+    public <init>(android.content.Context);
+    public <init>(android.content.Context, android.util.AttributeSet);
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+    public void set*(...);
+}
+
+# Preserve all classes that have special context constructors, and the
+# constructors themselves.
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet);
+}
+
+# Preserve the special fields of all Parcelable implementations.
+
+-keepclassmembers class * implements android.os.Parcelable {
+    static android.os.Parcelable$Creator CREATOR;
+}
+
+# Preserve static fields of inner classes of R classes that might be accessed
+# through introspection.
+
+-keepclassmembers class **.R$* {
+  public static <fields>;
+}
+
+# Preserve the required interface from the License Verification Library
+# (but don't nag the developer if the library is not used at all).
+
+-keep public interface com.android.vending.licensing.ILicensingService
+
+-dontnote com.android.vending.licensing.ILicensingService
+
+# The Android Compatibility library references some classes that may not be
+# present in all versions of the API, but we know that's ok.
+
+-dontwarn android.support.**
+
+# Preserve all native method names and the names of their classes.
+
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+#
+# Mozilla-specific rules
+#
+# Merging classes can generate dex warnings about anonymous inner classes.
+-optimizations !class/merging/horizontal
+-optimizations !class/merging/vertical
+
+# This optimisation causes corrupt bytecode if we run more than two passes.
+# Testing shows that running the extra passes of everything else saves us
+# more than this optimisation does, so bye bye!
+-optimizations !code/allocation/variable
+
+# Keep miscellaneous targets.
+
+# Keep Robocop targets. TODO: Can omit these from release builds. Also, Bug 916507.
+
+# Same formula as above...
+-keep @interface org.mozilla.gecko.annotation.RobocopTarget
+-keep @org.mozilla.gecko.annotation.RobocopTarget class *
+-keepclassmembers class * {
+    @org.mozilla.gecko.annotation.RobocopTarget *;
+}
+-keepclassmembers @org.mozilla.gecko.annotation.RobocopTarget class * {
+    *;
+}
+-keepclasseswithmembers class * {
+    @org.mozilla.gecko.annotation.RobocopTarget <methods>;
+}
+-keepclasseswithmembers class * {
+    @org.mozilla.gecko.annotation.RobocopTarget <fields>;
+}
+
+-keep class **.R$*
+
+# Keep all interfaces that might be dynamically required by Java Addons.
+-keep class org.mozilla.javaaddons.* {
+    *;
+}
+
+-keep class org.mozilla.javaaddons.*$* {
+    *;
+}
+
+# Disable obfuscation because it makes exception stack traces more difficult to read.
+-dontobfuscate
+
+# Suppress warnings about missing descriptor classes.
+#-dontnote **,!ch.boye.**,!org.mozilla.gecko.sync.**
+
+-include "play-services-keeps.cfg"
+
+# Don't print spurious warnings from the support library.
+# See: http://stackoverflow.com/questions/22441366/note-android-support-v4-text-icucompatics-cant-find-dynamically-referenced-cl
+-dontnote android.support.**
+
+-include "adjust-keeps.cfg"
+
+-include "leakcanary-keeps.cfg"
+
+-include "appcompat-v7-keeps.cfg"
+
+-include "proguard-android.cfg"
+
+-include "../../geckoview/proguard-rules.txt"