Keep mobile site's text wrap scale unchanged.

    public void onNewPicture(WebViewCore.DrawData drawData) {

        final int viewWidth = mWebView.getViewWidth();

        final boolean zoomOverviewWidthChanged = setupZoomOverviewWidth(drawData, viewWidth);

        final float newZoomOverviewScale = getZoomOverviewScale();

        WebSettings settings = mWebView.getSettings();

        if (zoomOverviewWidthChanged && settings.isNarrowColumnLayout() &&

            settings.getUseFixedViewport() &&

            (mInitialZoomOverview || mInZoomOverview)) {

            // Keep mobile site's text wrap scale unchanged.  For mobile sites,

            // the text wrap scale is the same as zoom overview scale, which is 1.0f.

            if (exceedsMinScaleIncrement(mTextWrapScale, 1.0f) ||

                    exceedsMinScaleIncrement(newZoomOverviewScale, 1.0f)) {

                mTextWrapScale = getReadingLevelScale();

            } else {

                mTextWrapScale = newZoomOverviewScale;

            }

        }

        final float zoomOverviewScale = getZoomOverviewScale();

        if (!mMinZoomScaleFixed) {

            mMinZoomScale = zoomOverviewScale;

            mMinZoomScale = newZoomOverviewScale;

        }

        // fit the content width to the current view. Ignore the rounding error case.

        if (!mWebView.drawHistory() && (mInitialZoomOverview || (mInZoomOverview

                && Math.abs((viewWidth * mInvActualScale) - mZoomOverviewWidth) > 1))) {

            mInitialZoomOverview = false;

            setZoomScale(zoomOverviewScale, !willScaleTriggerZoom(mTextWrapScale) &&

            setZoomScale(newZoomOverviewScale, !willScaleTriggerZoom(mTextWrapScale) &&

                !mWebView.getSettings().getUseFixedViewport());

        }

    }