CSS Animations: add interpolation test for max-height

CSS max-height should not be negative: interpolator fails for that case.

Review URL: https://chromiumcodereview.appspot.com/23523020

git-svn-id: svn://svn.chromium.org/blink/trunk@157347 bbb929c8-8fbe-4397-9dbb-9b2b20218538
CSS Animations: add interpolation test for right

Review URL: https://chromiumcodereview.appspot.com/23504004

git-svn-id: svn://svn.chromium.org/blink/trunk@157348 bbb929c8-8fbe-4397-9dbb-9b2b20218538
CSS Animations: add interpolation test for top

Review URL: https://chromiumcodereview.appspot.com/23840005

git-svn-id: svn://svn.chromium.org/blink/trunk@157349 bbb929c8-8fbe-4397-9dbb-9b2b20218538
CSS Animations: add interpolation test for color

Review URL: https://chromiumcodereview.appspot.com/23896003

git-svn-id: svn://svn.chromium.org/blink/trunk@157350 bbb929c8-8fbe-4397-9dbb-9b2b20218538
CSS Animations: add interpolation test for opacity

Review URL: https://chromiumcodereview.appspot.com/23532038

git-svn-id: svn://svn.chromium.org/blink/trunk@157351 bbb929c8-8fbe-4397-9dbb-9b2b20218538
CSS Animations: add interpolation test for min-height

CSS min-height should not be negative: interpolator fails for that case.

Review URL: https://chromiumcodereview.appspot.com/23925003

git-svn-id: svn://svn.chromium.org/blink/trunk@157352 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move Node::diff into RenderStyle and break it into parts

Node::diff doesn't actually diff nodes, but instead compares RenderStyles. This patch
renames it RenderStyle::compare and breaks it out into several functions. It also
reworks the function to be easier to understand by grouping related comparisons
and using early returns.

Review URL: https://chromiumcodereview.appspot.com/23541007

git-svn-id: svn://svn.chromium.org/blink/trunk@157353 bbb929c8-8fbe-4397-9dbb-9b2b20218538