Issue also observed in M62(9807.0.0, 62.0.3176.0)

Same behavior observed with volume bar also. Unable to reduce the volume. able to mute but not able to reduce volume.

Same issue observed in Version 61.0.3163.70 (Official Build) beta

fukino@ - Can we investigate this for a bug fix for M62? We are getting a few reports about this being broken.

I'll look into this.

This issue starts from https://chromium-review.googlesource.com/565067
There might be a breaking change in paper-slider v1.0.15 -> v2.0.2
I'll look into how to fix the issue.

+keanulee from Polymer.

Here [1] are the changes between v1.0.15 and v2.0.2.
I'm not familiar with this codebase, but at a cursory glance I see that many values in paper-slider.html were either multiplied or divided by 100. That might be relevant?

[1] https://github.com/PolymerElements/paper-slider/compare/v1.0.15...v2.0.2

Yes, that was a change I made to fix this long-standing issue (https://github.com/PolymerElements/paper-slider/pull/194). Going forward, ratio will be between 0-100.

Thanks.
The fix will be straightforward (i.e. will divide |ratio| returned by paper-slider by 100 in video player).

As far as I checked, the |ratio| property is not referred in chrome://settings, so the Settings page should not be affected.

Re: #5
I'll request a merge of the fix to M61 too, since the sliders for both seek and volume are not usable by this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/81d2a76092eeeae60ce48ed5690567bd8f1dfbb0

commit 81d2a76092eeeae60ce48ed5690567bd8f1dfbb0
Author: Naoki Fukino <fukino@chromium.org>
Date: Fri Sep 01 04:40:13 2017

Video player: Interpret paper-slider's ratio property properly.

paper-slider v2.0.2 has a breaking change.
https://github.com/PolymerElements/paper-slider/pull/194
|ratio| property used to return a value in [0, 1], but now it returns a value in
[0, 100].
Making video player to catch up this change by dividing |ratio| property by 100.

Bug:  752283 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Iad994a2dd7f8a6e5b77698a0deec0812c70fb045
Reviewed-on: https://chromium-review.googlesource.com/646153
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#499126}
[modify] https://crrev.com/81d2a76092eeeae60ce48ed5690567bd8f1dfbb0/ui/file_manager/video_player/js/media_controls.js

This bug requires manual review: We are only 3 days from stable.
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), ketakid@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Approved merge to M61.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b32e7eca17598618017f5402b66ca2781a0eccc9

commit b32e7eca17598618017f5402b66ca2781a0eccc9
Author: Naoki Fukino <fukino@chromium.org>
Date: Mon Sep 04 03:49:38 2017

Video player: Interpret paper-slider's ratio property properly.

paper-slider v2.0.2 has a breaking change.
https://github.com/PolymerElements/paper-slider/pull/194
|ratio| property used to return a value in [0, 1], but now it returns a value in
[0, 100].
Making video player to catch up this change by dividing |ratio| property by 100.

TBR=fukino@chromium.org

(cherry picked from commit 81d2a76092eeeae60ce48ed5690567bd8f1dfbb0)

Bug:  752283 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Iad994a2dd7f8a6e5b77698a0deec0812c70fb045
Reviewed-on: https://chromium-review.googlesource.com/646153
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Naoki Fukino <fukino@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#499126}
Reviewed-on: https://chromium-review.googlesource.com/647508
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/branch-heads/3163@{#1093}
Cr-Branched-From: ff259bab28b35d242e10186cd63af7ed404fae0d-refs/heads/master@{#488528}
[modify] https://crrev.com/b32e7eca17598618017f5402b66ca2781a0eccc9/ui/file_manager/video_player/js/media_controls.js

Requesting a merge to M62 too.

Your change meets the bar and is auto-approved for M62. Please go ahead and merge the CL to branch 3202 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), bhthompson@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/02a0ff2716c6dce7d154fda96d9ae3a00957211e

commit 02a0ff2716c6dce7d154fda96d9ae3a00957211e
Author: Naoki Fukino <fukino@chromium.org>
Date: Tue Sep 05 06:12:05 2017

Video player: Interpret paper-slider's ratio property properly.

paper-slider v2.0.2 has a breaking change.
https://github.com/PolymerElements/paper-slider/pull/194
|ratio| property used to return a value in [0, 1], but now it returns a value in
[0, 100].
Making video player to catch up this change by dividing |ratio| property by 100.

TBR=fukino@chromium.org

(cherry picked from commit 81d2a76092eeeae60ce48ed5690567bd8f1dfbb0)

Bug:  752283 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Iad994a2dd7f8a6e5b77698a0deec0812c70fb045
Reviewed-on: https://chromium-review.googlesource.com/646153
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Naoki Fukino <fukino@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#499126}
Reviewed-on: https://chromium-review.googlesource.com/650186
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/branch-heads/3202@{#19}
Cr-Branched-From: fa6a5d87adff761bc16afc5498c3f5944c1daa68-refs/heads/master@{#499098}
[modify] https://crrev.com/02a0ff2716c6dce7d154fda96d9ae3a00957211e/ui/file_manager/video_player/js/media_controls.js

Verified on 9765.61.0, 61.0.3163.87. 

Verified on 9901.12.0, 62.0.3202.18