Unable to reproduce the issue on reported chrome version 68.0.3440.75 using Mac 10.13.5 and Windows 10. Attaching screen-cast for reference.
Steps: 
---------
1. Launched reported chrome 
2. Enabled chrome flag #enable-gpu-rasterization
3. Navigated to given URL " https://codepen.io/emeeks/pen/EpoRNw " 
As we are observed that The full length of the path is stroked

@Reporter: Could you please review the attached screen-cast and confirm if anything being missed here.Request you to retry this issue with fresh profile without any extensions/apps or reset all the flags and let us know if issue still persists.

Thanks..!

Deleted: 869172.mp4 2.8 MB

	869172.mp4 2.8 MB View Download

phanindra.mandapaka@, your video shows the problem. The top line should be the same length as the bottom line, at least according to Firefox.

But this is a GPU rendering issue, so over to them. And increasing the priority. Not being able to draw a line is a pretty serious problem. My guess is that this is the same as https://bugs.chromium.org/p/chromium/issues/detail?id=812720

senorblanco: more gpu path rasterization bugs for you to triage/investigate

This one seems to be related to the AALinearizingConvexPathRenderer. If I comment that out in GrPathRendererChain, the bug disappears.

Brian, could you take a look and/or triage?

I have a repro and SKP. On my linux machine I only get the repro if I increase the zoom.

The following revision refers to this bug:
  https://skia.googlesource.com/skia/+/0235c648b7dbf0c8ef8741d376b041383678a369

commit 0235c648b7dbf0c8ef8741d376b041383678a369
Author: Brian Salomon <bsalomon@google.com>
Date: Fri Aug 31 17:34:23 2018

Fix GrAAConvexTessellator colinear point removal.

We weren't checking whether the new point in lineTo was backtracking or not.

Also:
Replace distance-to-line check with triangle area check. The previous check
was asymmetric. Given point sequence (a, b, c) it might make a different
decision than when given (c, b, a).

Compute normals late since we don't use them to detect colinear edges
anymore.

Rename SkPointPriv::SetOrhog -> SkPointPriv::MakeOrthog and return
computed value rather than take SkPoint* dst.

Bug:  chromium:869172 


Change-Id: I8da53edf1a2e6098f4199da57368ebb644866e4c
Reviewed-on: https://skia-review.googlesource.com/150682
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

[modify] https://crrev.com/0235c648b7dbf0c8ef8741d376b041383678a369/gm/convex_all_line_paths.cpp
[modify] https://crrev.com/0235c648b7dbf0c8ef8741d376b041383678a369/src/gpu/ops/GrAAConvexPathRenderer.cpp
[modify] https://crrev.com/0235c648b7dbf0c8ef8741d376b041383678a369/src/gpu/ops/GrAAConvexTessellator.cpp
[modify] https://crrev.com/0235c648b7dbf0c8ef8741d376b041383678a369/src/gpu/GrPathUtils.cpp
[modify] https://crrev.com/0235c648b7dbf0c8ef8741d376b041383678a369/src/gpu/ops/GrAAConvexTessellator.h
[modify] https://crrev.com/0235c648b7dbf0c8ef8741d376b041383678a369/src/gpu/ops/GrAAHairLinePathRenderer.cpp
[modify] https://crrev.com/0235c648b7dbf0c8ef8741d376b041383678a369/src/core/SkPointPriv.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f4aa8aad2ecf12eeebe43ac9c6fcd709b3de0ccd

commit f4aa8aad2ecf12eeebe43ac9c6fcd709b3de0ccd
Author: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Date: Fri Aug 31 20:30:18 2018

Roll src/third_party/skia 9951cbf4ca79..7bfe8438a94b (13 commits)

https://skia.googlesource.com/skia.git/+log/9951cbf4ca79..7bfe8438a94b


git log 9951cbf4ca79..7bfe8438a94b --date=short --no-merges --format='%ad %ae %s'
2018-08-31 bsalomon@google.com Test glbetex and glbert configs on BonusConfigs bots
2018-08-31 swiftshader-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com Roll third_party/externals/swiftshader 5fb5e817a20d..fe5861bf5bb1 (1 commits)
2018-08-31 stani@google.com Support more hardware buffer formats
2018-08-31 michaelludwig@google.com Fixes for primitive handling for uniforms
2018-08-31 jvanverth@google.com Simplify perspective shadows to match future MD specs.
2018-08-31 fmalita@chromium.org [skottie] Lazily-initialized default font manager
2018-08-31 benjaminwagner@google.com Unomit passing tests for Radeon.
2018-08-31 benjaminwagner@google.com Remove GTX1070 and GTX1050 jobs.
2018-08-31 bsalomon@google.com Fix GrAAConvexTessellator colinear point removal.
2018-08-31 benjaminwagner@google.com [infra] Add rack dimension for QuadroP400 tasks.
2018-08-31 benjaminwagner@google.com Unomit passing tests for Win Intel.
2018-08-31 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2018-08-31 brianosman@google.com Revert "Add support for gray + colorspace to SkCodec"


Created with:
  gclient setdep -r src/third_party/skia@7bfe8438a94b

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel

BUG=chromium:113555199, chromium:869172 ,chromium:784662
TBR=stephana@chromium.org

Change-Id: I75ea11ce12a9a2eed101571b2adfde0c7c93ced8
Reviewed-on: https://chromium-review.googlesource.com/1199694
Reviewed-by: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#588150}
[modify] https://crrev.com/f4aa8aad2ecf12eeebe43ac9c6fcd709b3de0ccd/DEPS