Bug 982569 - Don't hard-code the page size. r=khuey
Bug 985155 - Add signal trampoline on ARM Linux to work around kernel bug. r=snorp
Bug 991545 - Update SVGTransformableElement::GetAttributeChangeHint to use nsChangeHint_UpdatePostTransformOverflow. r=longsonr

- When only the transform is changed,
  SVGTransformableElement::GetAttributeChangeHint returns
  nsChangeHint_UpdatePostTransformOverflow to avoid extraneous calls to
  UpdateOverflow in OverflowChangedTracker::Flush.
- nsSVGElement::DidAnimateTransformList now receives a modType parameter
  that is set by callers to either nsIDOMMutationEvent::ADDITION,
  nsIDOMMutationEvent::REMOVAL, or nsIDOMMutationEvent::MODIFICATION.
- SVGTransformableElement::GetAttributeChangeHint uses the passed modType
  to accurately select when to return nsChangeHint_UpdatePostTransformOverflow.
Bug 997913 - Seed gfx/doc with some high level documentation to allow for more people to update them. r=nsilva