Save pdf position, scale size

[willbchang]

Feature requested by @sarahyoungvii
Since chrome doesn't provide an API Documentation for this, it can be hard to do in a raw way.

• https://stackoverflow.com/questions/40639705/is-there-a-way-to-style-google-chrome-default-pdf-viewer
• https://stackoverflow.com/questions/55087949/chrome-extension-how-to-get-current-page-number-of-opened-pdf-file-on-browser
• https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/pdf_open_parameters.pdf
• https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDFOpenParams.pdf
• https://stackoverflow.com/questions/14210865/google-chrome-pdf-viewer-api
• https://bugs.chromium.org/p/pdfium/issues/list
• https://jsreport.net/learn/chrome-pdf

For PDF Viewer Extension

$('#viewerContainer').scrollTop
window.innerHight
$('#viewerContainer').scrollHeight

[willbchang]

#51 same thing
https://manga.bilibili.com/mc24742/218236

$('.ps-container').scrollTop
window.innerHeight
$('.ps-container').scrollHeight