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Currently, PrintPreviewUI knows only if a source is modifiable or not.
Both PDF and Flash sources are not modifiable and there is no way to
distinguish them in the print preview UI. Knowing this information will
allow changes to PDF printing while Flash is still supported on Chrome.

The Renderer process can determine if the source is a PDF if a PDF
interface can be loaded in the PepperPluginInstanceImpl class. The
information is then relayed to the Browser process through an
existing IPC message.

Bug: 989978
Change-Id: If04a82d77d330e53a7425fcc9fdda862371f8bae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1788484Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695971}