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In OutOfProcessInstance, the attributes `zoom_`, `device_scale_`,
`first_paint_` and `in_paint_` are used for drawing graphics, and they
will be used by PdfViewWebPlugin in the future. Therefore this CL moves
them into PdfViewPluginBase so that they can be shared between
PdfViewWebPlugin and OutOfProcessInstance, and adds accessors and
mutators for them.

Meanwhile, to avoid providing pointer access to `in_paint_`, this CL
moves the definition of OnPaint() into PdfViewPluginBase while keeping
the majority of its functionality wrapped in DoPaint(), which is
delegated to PdfViewPluginBase's derived classes.

Bug: 1140629
Change-Id: Ie2439d883836d5755ca4d86291ae9ccecc1b07a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601039Reviewed-by: K. Moon <kmoon@chromium.org>
Commit-Queue: Hui Yingst <nigi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839202}