The popup menu in the stocks app is supposed to size its width to the max
intrinsic width of the menu. This CL teaches it how to do that.

It's a shame that we need to ceilToDouble the output of RenderParagraph. If we
don't do that, we run into floating point layout trouble and the menu triggers
a line break. The correct fix is to do layout in fixed point.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1168113005

I don't think this is the final API we're going to use.

I suspect we'll add a TextStyle struct to hold
color and size, etc. which back-ends into CSS like
this does today.

Currently no one uses this color even though it exists.

This is one step towards fixing:
https://github.com/domokit/mojo/issues/213

R=ianh@google.com

Review URL: https://codereview.chromium.org/1162573007

This CL splits getIntrinsicDimensions into getMinIntrinsicWidth,
getMaxIntrinsicWidth, getMinIntrinsicHeight, and getMaxIntrinsicHeight so that
we can properly shrink-wrap the stocks app menu. This CL just contains the
refactoring. The use in stocks app will come in a later CL.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1167293003

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1156383006

Export Point, Size, Rect, Color, Paint, Path, BoxDecoration, Border, BorderSide, EdgeDims, and FlexDirection from fn2.dart
That way most of our libraries don't have to use sky.Foo all over the place, and we can reduce the number of imports in most Dart components.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1161323004

Improve the RenderObject.toString() logic so that there's not blank lines everywhere and to generally be better.
Adds sizes, positions, transforms, improves RenderParagraph's output.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1160233004

This makes debugging the render tree a lot easier. Just print the node
you care about, and you get an indented tree view of its subtree,
including settings. New subclasses should implement the new virtual
method debugDescribeSettings() to expose new settings.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1157993005

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1165013003

Also add operator==, hashCode, toString, and some basic Color constants to
Color.

R=abarth@chromium.org, ianh@google.com

Review URL: https://codereview.chromium.org/1162023004

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1166773003

Previously layout2.dart was a thousand lines long.

R=ianh@google.com

Review URL: https://codereview.chromium.org/1161003002