[webkit-reviews] review requested: [Bug 33408] Add flag IGNORE_FIXED_BACKGROUNDS (disabled by default) to ignore fixed background images and accelerate web page scrolling on low-powered/mobile devices : [Attachment 46509] Patch with test cases

[bugzilla-daemon at webkit.org]

Daniel Bates <dbates at webkit.org> has asked  for review:
Bug 33408: Add flag IGNORE_FIXED_BACKGROUNDS (disabled by default) to ignore
fixed background images and accelerate web page scrolling on low-powered/mobile
devices
https://bugs.webkit.org/show_bug.cgi?id=33408

Attachment 46509: Patch with test cases
https://bugs.webkit.org/attachment.cgi?id=46509&action=review

------- Additional Comments from Daniel Bates <dbates at webkit.org>
Based on the suggestions from both Simon Fraser and David Kilzer, I removed the
build system- and tools- related changes. Also, included in the patch expected
failure results for the Mac build.

I renamed IGNORE_FIXED_BACKGROUNDS to FAST_MOBILE_SCROLLING to be more
descriptive of what this change does. That is, accelerate scrolling for
low-powered/mobile devices.