implement some APIs needed for OctoDroid

src/api-impl/android/graphics/Paint.java

@@ -209,6 +209,12 @@ public class Paint {
 		private Join(int nativeInt) {}
 	}
 
+	public enum Align {
+		CENTER,
+		LEFT,
+		RIGHT,
+	}
+
 	public void setStrokeCap(Cap cap) {}
 
 	public void setStrokeJoin(Join join) {}
@@ -217,6 +223,12 @@ public class Paint {
 		return new Typeface();
 	}
 
+	public void setTextAlign(Align align) {}
+
+	public Shader getShader() {
+		return new Shader();
+	}
+
 	private native long native_constructor();
 	private native void native_set_color(long skia_paint, int color);
 	private native int native_get_color(long skia_paint);