Fix memory leak with layers.

                        // updates is a C++ pointer to a Vector of

                        // AnimationValues that we apply to the layers.

                        // The Vector is deallocated in nativeUpdateLayers().

                        nativeUpdateLayers(mRootLayer, updates);

                        nativeUpdateLayers(updates);

                    }

                    invalidate();

                    break;

    private native void     nativeDestroyLayer(int layer);

    private native int      nativeEvaluateLayersAnimations(int layer);

    private native boolean  nativeLayersHaveAnimations(int layer);

    private native void     nativeUpdateLayers(int layer, int updates);

    private native void     nativeUpdateLayers(int updates);

    private native void     nativeDrawLayers(int layer,

                                             int scrollX, int scrollY,

                                             int width, int height,