[Webkit-unassigned] [Bug 126190] New: [SVG] Fix root element length values handling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126190

           Summary: [SVG] Fix root element length values handling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: zimmermann at kde.org, simon.fraser at apple.com,
                    dino at apple.com, thorton at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/a7dedf81eb7008276bb6854f0e46465e039788f8

SVGLengthContext::determineViewport() currently asserts that we're not
resolving lengths for the topmost element, but there's nothing to prevent such calls.

The CL updates determineViewport() to handle root elements geracefully
(using their current viewport). It also changes the signature slightly
to operate directly on a FloatSize, reducing some of the boiler-plate client code.

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