[Webkit-unassigned] [Bug 113171] New: Allow ShadowContents in HitTests by default.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113171

           Summary: Allow ShadowContents in HitTests by default.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hayato at chromium.org
                CC: webcomponents-bugzilla at chromium.org
            Blocks: 112096


HitTestRequest is widely used in WebCore, but AllowShadowContents flag is not turned on by default.
In most of such places, we can set the flag on.

To track all existing HitTests which does not allow Shadow Contents, and discourage further HitTests which does now allow Shadow Contents in the future, we should turn AllowShadowContents flag on by default.

Instead of AllowShadowContent flag, we should introduce disallowShadowContenet flag so that callers must set this flag on explicitly if they want to disallow Shadow Trees in HitTests,.

This change should be just refactoring and should not include any behavior changes. 
After this change, we'll investigate each place where disallowShadowContents is used and get rid of the flag if it is okay to remove.

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