Roll src/third_party/pdfium 693460a3a7b7..f57843cb20ee (4 commits)

https://pdfium.googlesource.com/pdfium.git/+log/693460a3a7b7..f57843cb20ee

git log 693460a3a7b7..f57843cb20ee --date=short --no-merges --format='%ad %ae %s'
2019-09-25 thestig@chromium.org Reformat radial shading pixel tests.
2019-09-25 thestig@chromium.org Add an axial shading pixel test.
2019-09-25 thestig@chromium.org Fix nits in CPDF_RenderStatus.
2019-09-25 thestig@chromium.org Fix crashes in FPDFClipPath_CountPaths() and friends.

Created with:
  gclient setdep -r src/third_party/pdfium@f57843cb20ee

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/+/master/autoroll/README.md

TBR=pdfium-deps-rolls@chromium.org

Bug: None
Change-Id: I95d4aab1e7a46e86c56b6451a38a70134691a699
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825590Reviewed-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@{#699969}

DEPS

@@ -182,7 +182,7 @@ 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': '693460a3a7b74d8830a40808684d29876b3c13b9',
+  'pdfium_revision': 'f57843cb20ee8d7c38513d9a26ff5df54d796c7a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.