Bring in the rest of relevant changes from #10402

Author: grendello

src/Microsoft.Android.Runtime.NativeAOT/Android.Runtime.NativeAOT/JavaInteropRuntime.cs

@@ -58,9 +58,9 @@ static void init (IntPtr jnienv, IntPtr klass, IntPtr classLoader)
 
 			// Entry point into Mono.Android.dll
 			JNIEnvInit.InitializeJniRuntime (runtime);
+			XA_Host_NativeAOT_OnInit ();
 
 			transition  = new JniTransition (jnienv);
-			XA_Host_NativeAOT_OnInit ();
 
 			var handler = Java.Lang.Thread.DefaultUncaughtExceptionHandler;
 			Java.Lang.Thread.DefaultUncaughtExceptionHandler = new UncaughtExceptionMarshaler (handler);

src/Microsoft.Android.Runtime.NativeAOT/Java.Interop/JreRuntime.cs

@@ -61,8 +61,8 @@ static NativeAotRuntimeOptions CreateJreVM (NativeAotRuntimeOptions builder)
 			builder.TypeManager     ??= new ManagedTypeManager ();
 #endif  // NET
 
-			builder.ValueManager            ??= new SimpleValueManager ();
-			builder.ObjectReferenceManager  ??= new ManagedObjectReferenceManager (builder.JniGlobalReferenceLogWriter, builder.JniLocalReferenceLogWriter);
+			builder.ValueManager            ??= ManagedValueManager.GetOrCreateInstance();
+			builder.ObjectReferenceManager  ??= new Android.Runtime.AndroidObjectReferenceManager ();
 
 			if (builder.InvocationPointer != IntPtr.Zero || builder.EnvironmentPointer != IntPtr.Zero)
 				return builder;

src/Mono.Android/Android.Runtime/AndroidRuntime.cs

@@ -102,7 +102,8 @@ public AndroidRuntimeOptions (IntPtr jnienv,
 		}
 	}
 
-	class AndroidObjectReferenceManager : JniRuntime.JniObjectReferenceManager {
+	// TODO: this shouldn't be public
+	public class AndroidObjectReferenceManager : JniRuntime.JniObjectReferenceManager {
 		public override int GlobalReferenceCount {
 			get {return RuntimeNativeMethods._monodroid_gref_get ();}
 		}

src/Mono.Android/Android.Runtime/JNIEnvInit.cs

@@ -82,6 +82,10 @@ static Type TypeGetType (string typeName) =>
 		internal static void InitializeJniRuntime (JniRuntime runtime)
 		{
 			androidRuntime = runtime;
+			gref_gc_threshold = RuntimeNativeMethods._monodroid_max_gref_get ();
+			if (gref_gc_threshold != int.MaxValue) {
+				gref_gc_threshold = checked((gref_gc_threshold * 9) / 10);
+			}
 			SetSynchronizationContext ();
 		}