Roll src/third_party/skia 4b3050b:093b4e8

Roll src/third_party/skia 4b3050b:093b4e8

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/4b3050b..093b4e8

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=mtklein@google.com

Commits in this roll:
093b4e8 reed@chromium.org - allow for stepping through a picture with 'n' and 'p' - save current slide as .skp with 'K'
fb8c1fc reed@chromium.org Revert of IWYU: 'core' target, files starting A-C. (patchset #5 id:80001 of https://codereview.chromium.org/1265033002/ )
7403d87 bungeman@google.com IWYU: 'core' target, files starting A-C.
1b99b54 borenet@google.com Whitespace change to test Gerrit ACLs
d029ded mtklein@chromium.org Port morphology to SkOpts.
9f8754f halcanary@google.com Remove experimental/PdfViewer
1dedc3d fmalita@chromium.org SkPictureImageGenerator
8caa5af mtklein@chromium.org Reorganize to keep similar code together.
8e47cdb borenet@google.com whitespace change to test whether I can commit
6c3c4ea mtklein@chromium.org Remove dead code.
84cd621 senorblanco@chromium.org Implement caching of filled paths in the tessellated path renderer.
846b022 joshualitt@chromium.org Break LCD and Bitmap text dependency on hardcoded atlas values
1c005e4 scroggo@chromium.org Create a scanline decoder without creating a codec
ddc726f joshualitt@chromium.org Add cheat sheet to wrangler doc
dce5ce4 mtklein@chromium.org Port SkBlurImage opts to SkOpts.
562a66b mtklein@chromium.org Revert "Implement caching of filled paths in the tessellated path renderer." This reverts commit 468dfa72eb6694145487be17876804dfca3b7adb.
dea6e1c reed@google.com update image bench to test gpu and cpu images against raster surface
6f1216a reed@google.com cache private readback for gpu-images
fae0102 robertphillips@google.com Remove IGNORE_ROT_AA_RECT_OPT flag

Review URL: https://codereview.chromium.org/1269293002

Cr-Commit-Position: refs/heads/master@{#341863}