[Webkit-unassigned] [Bug 64973] New: Add [Optional=CallWithDefaultValues] flag and use it in initXXXEvent declarations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64973

           Summary: Add [Optional=CallWithDefaultValues] flag and use it
                    in initXXXEvent declarations
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pilgrim at chromium.org
                CC: abarth at webkit.org


As discussed in IRC, we are doing away with the interface-level LegacyDefaultOptionalArguments flag. To handle some cases of the old behavior, we need to define a new (argument-level) flag so that functions can define optional arguments but not have to declare every single combination of arguments in C++. The old code generator handled this by calling a single C++ function with all arguments, but with default values for the "optional" arguments. Thus, this patch invents a new argument-level flag called [Optional=CallWithDefaultValue] that emulates the old behavior.

This patch also fixes all the initXXXEvent declarations to remove the LegacyDefaultOptionalArguments flag and use the new [Optional=CallWithDefaultValue] flag on arguments that require it for backward compatibility.

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