Merge 92002 - Scroll animation refinements.

Merge 92002 - Scroll animation refinements.
https://bugs.webkit.org/show_bug.cgi?id=65154

Patch by Scott Byer <scottbyer@chromium.org>; on 2011-07-29
Reviewed by Adam Barth.

Fix scroll animation bugs when scrolling to the ends of a document. Smooth over slow event repeat rates
better. Fix tests to allow for unit testing of scrolling up and not just down.

Source/WebCore:

Additional unit tests added to ScrollAnimatorNoneTest:
ScrollQuadraticSmoothed, ScrollLotsQuadraticSmoothed, ScrollDownToBumper, ScrollUpToBumper

* platform/ScrollAnimatorNone.cpp:
(WebCore::ScrollAnimatorNone::Parameters::Parameters):
(WebCore::ScrollAnimatorNone::PerAxisData::updateDataFromParameters):
(WebCore::ScrollAnimatorNone::scroll):
* platform/ScrollAnimatorNone.h:

Source/WebKit/chromium:

Additional unit tests added to ScrollAnimatorNoneTest:
ScrollQuadraticSmoothed, ScrollLotsQuadraticSmoothed, ScrollDownToBumper, ScrollUpToBumper

* tests/ScrollAnimatorNoneTest.cpp:
(ScrollAnimatorNoneTest::reset):
(ScrollAnimatorNoneTest::updateDataFromParameters):
(ScrollAnimatorNoneTest::animateScroll):
(ScrollAnimatorNoneTest::checkDesiredPosition):
(ScrollAnimatorNoneTest::checkSoftLanding):

TBR=commit-queue@webkit.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=92726