Revert of Remove unused PPB_View_Dev (patchset #3 of https://codereview.chromium.org/498123002/)

Reason for revert:
I should've checked sooner; this is apparently still used by Flash. (See go/UMA, histograms, Pepper.InterfaceUsed)

Original issue's description:
> Remove unused PPB_View_Dev
>
> [email protected]
>
> Committed: https://chromium.googlesource.com/chromium/src/+/2210d5fb49cd4b75972f2e304b29637c050de4f1

[email protected],[email protected]
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/512703003

Cr-Commit-Position: refs/heads/master@{#292152}
17 files changed