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Generates a PDF of the webView and invokes the callback with the NSData of the PDF or nil if a PDF couldn't be generated.

The WebState calls the WebController that will invoke WKWebViewUtility's CreateFullPagePDF with the current webView. The callback is passed though at each step.

Bug: 1103777
Change-Id: I3b83082937849e2851f6ceb1954b91cc0bc242ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295784
Commit-Queue: Julian Mentasti-Meza <jmentasti@google.com>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790411}