Clean up GradientDrawable styled attributes, fix useLevelForShape

        public int mThickness = -1;

        public boolean mDither = false;

        private float mCenterX = 0.5f;

        private float mCenterY = 0.5f;

        private float mGradientRadius = 0.5f;

        private int mGradientRadiusType = RADIUS_TYPE_PIXELS;

        private boolean mUseLevel;

        private boolean mUseLevelForShape;

        private boolean mOpaqueOverBounds;

        private boolean mOpaqueOverShape;

        float mCenterX = 0.5f;

        float mCenterY = 0.5f;

        float mGradientRadius = 0.5f;

        int mGradientRadiusType = RADIUS_TYPE_PIXELS;

        boolean mUseLevel = false;

        boolean mUseLevelForShape = true;

        boolean mOpaqueOverBounds;

        boolean mOpaqueOverShape;

        ColorStateList mTint = null;

        PorterDuff.Mode mTintMode = DEFAULT_TINT_MODE;