Merge "Adding dither to workspace scrim" into tm-qpr-dev

        mMaskHeight = ResourceUtils.pxFromDp(ALPHA_MASK_BITMAP_DP,

                view.getResources().getDisplayMetrics());

        mTopScrim = Themes.getAttrDrawable(view.getContext(), R.attr.workspaceStatusBarScrim);

        mBottomMask = mTopScrim == null ? null : createDitheredAlphaMask();

        mHideSysUiScrim = mTopScrim == null;

        if (mTopScrim != null) {

            mTopScrim.setDither(true);

            mBottomMask = createDitheredAlphaMask();

            mHideSysUiScrim = false;

        } else {

            mBottomMask = null;

            mHideSysUiScrim = true;

        }

        mDrawWallpaperScrim = FeatureFlags.ENABLE_WALLPAPER_SCRIM.get()

                && !Themes.getAttrBoolean(view.getContext(), R.attr.isMainColorDark)