8349924: Additional WebKit 620.1 fixes from WebKitGTK 2.46.6

[jaybhaskar]

WebkitGTK 2.46.6 has additional fixes for crash and rendering issue, the crash fix is related to Skia CPU rendering which does not apply to JavaFX Webkit.
This patch has been tested on Jenkins and there is no side effects introduced.

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed (2 reviews required, with at least 1 Reviewer, 1 Author)

Issue

• JDK-8349924: Additional WebKit 620.1 fixes from WebKitGTK 2.46.6 (Bug - P2)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jfx.git pull/1722/head:pull/1722
$ git checkout pull/1722

Update a local copy of the PR:
$ git checkout pull/1722
$ git pull https://git.openjdk.org/jfx.git pull/1722/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1722

View PR using the GUI difftool:
$ git pr show -t 1722

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jfx/pull/1722.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back jbhaskar! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[mlbridge]

Webrevs

• 01: Full - Incremental (3b4a5f86)
• 00: Full (c14365f1)

[kevinrushforth]

Reviewers: @kevinrushforth @tiainen or @johanvos

/reviewers 2

[openjdk]

@kevinrushforth
The total number of required reviews for this PR (including the jcheck configuration and the last /reviewers command) is now set to 2 (with at least 1 Reviewer, 1 Author).

[kevinrushforth]

I left a couple (minor) questions, but the changes look good to me. I'll test it early next week.