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The motivation to do this is to be able to convert in annotation mode
when the plugin is not active.

Fortunately it turns out that there is enough information to do this
without communicating with the plugin -- the dimensions of each page
are available and the translation from points to pixels is straightforward.

This new implementation also deals with the case where the
document has been rotated.

Bug: 902646
Change-Id: Id2814f96f6020c44cee07f725f5170494f1b512b
Reviewed-on: https://chromium-review.googlesource.com/c/1347646Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dstockwell <dstockwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611940}