Fix bug #11537133 Hideycling looks broken (KOT36), missing left padding

- enforce the Drawable boolean getPadding(Rect) contract for NinePatchDrawable
and DrawableContainer.

- as NinePatchDrawable was not enforcing it, the consequence was that the
mUserPaddingLeftInitial / mUserPaddingRitghInitial were reset to "0" (even
if they got the correct value before the reset).

Change-Id: I1efe7fad5f89c0ca47f90189f6d89940e0e9c6ae

graphics/java/android/graphics/drawable/DrawableContainer.java

@@ -88,9 +88,10 @@ public class DrawableContainer extends Drawable implements Drawable.Callback {
     @Override
     public boolean getPadding(Rect padding) {
         final Rect r = mDrawableContainerState.getConstantPadding();
-        boolean result = true;
+        boolean result;
         if (r != null) {
             padding.set(r);
+            result = (r.left | r.top | r.bottom | r.right) != 0;
         } else {
             if (mCurrDrawable != null) {
                 result = mCurrDrawable.getPadding(padding);