Test for WebKit Bug 103738 [CSS Regions] min-max height will not trigger a relayout when set on a region with auto-height

The test flows content in 3 regions, orange region and blue region have auto height, green region's height depends on orange region's height.

The test passes if all regions have the same height.

Content in region1. Content in region1. Content in region1. Content in region1. Content in region1

Content in region2. Content in region2. Content in region2. Content in region2. Content in region2.