Make sure SurfaceView use a 565 surface when requesting an OPAQUE format.

this is needed for backward compatibility with somewhat buggy applications.
not a big deal, since the app can request another format explicitely.

Change-Id: Ic73f8acedf94ffc0115637efac28fa8ffaa7e5a4

core/java/android/view/SurfaceView.java

@@ -724,6 +724,12 @@ public class SurfaceView extends View {
         }
 
         public void setFormat(int format) {
+
+            // for backward compatibility reason, OPAQUE always
+            // means 565 for SurfaceView
+            if (format == PixelFormat.OPAQUE)
+                format = PixelFormat.RGB_565;
+
             mRequestedFormat = format;
             if (mWindow != null) {
                 updateWindow(false);