Add some missing APIs.

android.widget.Filter and android.webkit.MimeTypeMap are copied from
AOSP. Other new classes are only stub implementations.

src/api-impl/android/graphics/drawable/DrawableContainer.java

@@ -0,0 +1,13 @@
+package android.graphics.drawable;
+
+import android.graphics.Canvas;
+
+public class DrawableContainer extends Drawable {
+
+	@Override
+	public void draw(Canvas canvas) {
+		// TODO Auto-generated method stub
+		throw new UnsupportedOperationException("Unimplemented method 'draw'");
+	}
+	
+}