Canvas FP values should be different when switching between standard and strict

[LaurenWags]

Description

Per discussion with @pes10k, if you change your FP shield setting from standard to strict, the Canvas FP values should not be the same between the two shield selections.

related issues: #9186 (Canvas FP farbling issue) and #12099 (Canvas Worker farbling issue)

Steps to Reproduce

1. Clean profile
2. Visit https://dev-pages.bravesoftware.com/farbling.html and/or https://dev-pages.brave.software/farbling.html
3. Note shield setting for FP (most likely standard)
4. Generate Fingerprints on the sites
5. Take a screenshot to note values for Canvas row
6. Change shield FP setting to strict for sites
7. Generate Fingerprints on the sites again

Actual result:

Look at Canvas row - values are the same for both FP shield settings
1.16.x FP = standard

1.16.x FP = strict

Expected result:

Canvas row values should be different when choosing the other (standard or strict) FP selection

Reproduces how often:

easily

Desktop Brave version:

Brave	1.16.58 Chromium: 86.0.4240.75 (Official Build) dev (x86_64)
Revision	c69c33933bfc72a159aceb4aeca939eb0087416c-refs/branch-heads/4240@{#1149}
OS	macOS Version 10.14.6 (Build 18G3020)

Android Device details:

• Install type (ARM, x86):
• Device type (Phone, Tablet, Phablet):
• Android version:

Version/Channel Information:

• Can you reproduce this issue with the current release? yes 1.15.x
• Can you reproduce this issue with the beta channel? yes 1.16.x
• Can you reproduce this issue with the nightly channel? yes 1.17.x

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

cc @pes10k @rebron

[pes10k]

Hi @LaurenWags are you still seeing this? I believe it should be fixed now. Can you verify when you have a chance?

[LaurenWags]

@pes10k appears fixed on latest Nightly 🎉

Brave | 1.24.46 Chromium: 90.0.4430.41 (Official Build) nightly (x86_64)
-- | --
Revision | e9c92b1eaca8487e212f3f6bc081fdb6d4863759-refs/branch-heads/4430@{#723}
OS | macOS Version 10.15.7 (Build 19H524)

Confirmed that Canvas FP values differ between the two pages once Fingerprints have been generated (columns 1 & 2 in table below).
Confirmed that Canvas FP values differ between standard/strict settings for the same page (rows 1 & 2 in table below).

FP = Standard	FP = Strict

---

Verification passed on

Brave	1.24.66 Chromium: 90.0.4430.72 (Official Build) beta (64-bit)
Revision	b6172ef8d07ef486489a4b11b66b2eaeed50d132-refs/branch-heads/4430@{#1233}
OS	Ubuntu 18.04 LTS

Verified test plan from the description

Confirmed that Canvas FP values differ between the two pages once Fingerprints have been generated (columns 1 & 2 in table below).
Confirmed that Canvas FP values differ between standard/strict settings for the same page (rows 1 & 2 in table below).

FP = Standard	FP = Strict

---

Verification passed on

Brave | 1.24.72 Chromium: 90.0.4430.72 (Official Build) dev (64-bit)
-- | --
Revision | b6172ef8d07ef486489a4b11b66b2eaeed50d132-refs/branch-heads/4430@{#1233}
OS | Windows 10 OS Version 2004 (Build 19041.928)

Verified test plan from the description

Confirmed that Canvas FP values differ between the two pages once Fingerprints have been generated (columns 1 & 2 in table below).
Confirmed that Canvas FP values differ between standard/strict settings for the same page (rows 1 & 2 in table below).

FP = Standard	FP = Strict

---

Verified PASSED on 1.24.76, Chromium 90.0.4430.85, Android 9, Google Pixel XL, arm64.

Verified test plan from the description

Confirmed that the Canvas FP values differ between standard/strict settings for the same page

standard	strict

[srirambv]

Verification passed on Samsung Tab A with Android 10 running 1.24.81 x64 build

• Verified Canvas FP value is different on both pages for pages for strict/standard settings