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This CL migrates `plugin_size_`, `plugin_dip_size_` and `plugin_offset_`
from OutOfProcessInstance to PdfViewPluginBase, and provides accessors
and mutators for them, so that these members can be used by both
PdfViewWebPlugin and OutOfProcessInstance.

Bug: 1140629
Change-Id: I0c3e2e6fa46233eab8e3b25b0d6101c6a557f80e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616732
Commit-Queue: Hui Yingst <nigi@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841694}