Roll PDFium from dbfb3029b9ff to 86263397d149 (2 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/dbfb3029b9ff..86263397d149

2020-12-11 tsepez@chromium.org Pass new flags to cppgc heap initialization.
2020-12-11 tsepez@chromium.org Roll v8/ 61f3e6140..c52956d09 (100 commits)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/pdfium-autoroll
Please CC pdfium-deps-rolls@chromium.org on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: chromium:1156170
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: I513306f17d1237a5ef067ee04d25e8a2ab4b88bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587405Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#836375}

DEPS

@@ -219,7 +219,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.
-  'pdfium_revision': 'dbfb3029b9fff176eef16a5871663965dfe1ce2a',
+  'pdfium_revision': '86263397d1497dcc189e474d1e6254d496ba4915',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.