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We want to prioritize loading and compositing tasks until first first
contentful paint, however that introduces some unintentional task
re-ordering which breaks
ChromeSitePerProcessBrowserPluginPDFTest.SendSyntheticTapGestureOOPIF.
Changing BrowserPlugin::Initialize to post a loading task removes
one source of reordering with the new scheduler policy, fixing the
the browser test.

Bug: 971191
Change-Id: I177d9189c980601893223425e36cd6657d058510
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819254Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699737}