[Webkit-unassigned] [Bug 70103] [chromium] Implement position:fixed in compositor thread

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70103


Hin-Chung Lam <hclam at google.com> changed:

           What    |Removed                     |Added
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 Attachment #111002|0                           |1
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--- Comment #9 from Hin-Chung Lam <hclam at google.com>  2011-10-20 09:06:03 PST ---
Created an attachment (id=111788)
 --> (https://bugs.webkit.org/attachment.cgi?id=111788&action=review)
Work in progress, attempt 2

The is the second attempt for implementing position:fixed in compositor thread.

This change assumes a position:fixed layer is a direct descendant from tree root. It walks up the tree to determine the scroll delta from parent and offset the scroll delta.

I've tested this with various test cases I've updated in this bug.

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