libservo: Modify the WebView::set_zoom to take final zoom value
#39738
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Previously in the
WebView::set_zoomAPI, we were multiplying the zoom value with the current page zoom. This made it hard to absolute zoom value or to reset the zoom value entirely. This PR modifies the API to take a final zoom value. Now it's the embedder's responsibility to calculate relative zoom changes.In addition, API is renamed to
WebView::set_page_zoom()andWebView::page_zoom()in order to better distinguished between page zoom and pinch zoom.Testing: Added unit test