[Webkit-unassigned] [Bug 179161] New: Eliminate isMainThread() checks in most call sites of NoEventDispatchAssertion

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179161

            Bug ID: 179161
           Summary: Eliminate isMainThread() checks in most call sites of
                    NoEventDispatchAssertion
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org
                CC: cdumez at apple.com

NoEventDispatchAssertion's constructor & destructor currently checks isMainThread() to make it work in non-main thread.
However, this check is rather expensive and prevents us from converting this into a release assertion.

Introduce NoEventDispatchAssertion::InMainThread which bypasses isMainThread() conditional
whenever the code can only be executed in the main thread.

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