add support for the boneheaded method of receiving input events that is used by NativeActivity apps

currently, our "not-actually-a-queue" implementation is quite ugly,
hopefully it might be possible to make it look somewhat sane while
not needing to make it as much of a queue as it is on android

src/api-impl/android/view/InputQueue.java

@@ -0,0 +1,24 @@
+package android.view;
+
+public final class InputQueue {
+	// for now, we will put a GtkEventController for the window here
+	private long native_ptr = 0;
+
+    public long getNativePtr() {
+        return native_ptr; // FIXME?
+    }
+
+    public static interface Callback {
+        /**
+         * Called when the given InputQueue is now associated with the
+         * thread making this call, so it can start receiving events from it.
+         */
+        void onInputQueueCreated(InputQueue queue);
+
+        /**
+         * Called when the given InputQueue is no longer associated with
+         * the thread and thus not dispatching events.
+         */
+        void onInputQueueDestroyed(InputQueue queue);
+    }
+}

src/api-impl/android/view/Window.java

@@ -33,4 +33,10 @@ public class Window {
 	}
 
 	private native void set_widget_as_root(long native_window, long widget);
+
+	public native void take_input_queue(long native_window, InputQueue.Callback callback, InputQueue queue);
+
+	public void takeInputQueue(InputQueue.Callback callback) {
+		take_input_queue(native_window, callback, new InputQueue());
+	}
 }