Make EdgeDims and BoxConstraints printable (for debugging)

Make EdgeDims and BoxConstraints printable (for debugging)

R=jackson@google.com

Committed: https://chromium.googlesource.com/external/mojo/+/a8fe5c791132e272096f4d467b4e09cb182cc480

[jackson, 2015-06-03 23:02:13]

jackson@google.com changed reviewers:
+ jackson@google.com

[jackson, 2015-06-03 23:02:13]

lgtm

[eseidel, 2015-06-03 23:23:16]

eseidel@chromium.org changed reviewers:
+ eseidel@chromium.org

[eseidel, 2015-06-03 23:23:17]

The hash bits look strange, but the toString looks fine.

https://codereview.chromium.org/1166523006/diff/1/sky/sdk/lib/framework/rende...
File sky/sdk/lib/framework/rendering/box.dart (right):

https://codereview.chromium.org/1166523006/diff/1/sky/sdk/lib/framework/rende...
sky/sdk/lib/framework/rendering/box.dart:42: value = 37 * value + top.hashCode;
Why the magic number?  And doesn't dart have a *=?

https://codereview.chromium.org/1166523006/diff/1/sky/sdk/lib/framework/rende...
sky/sdk/lib/framework/rendering/box.dart:103: value = 37 * value +
minWidth.hashCode;
Maybe we want a hash() helper which can take N num values and spit out a hash?

[Hixie, 2015-06-03 23:43:44]

The hash code is just copying with the matrix code does. Not sure where the 373
comes from.
*= wouldn't work in this case (there's also an addition).
We could do a hash() helper, but creating a list just to do this seems like a
lot of code to run when you're getting a hashCode...

[Hixie, 2015-06-04 00:24:36]

Committed patchset #1 (id:1) manually as
a8fe5c791132e272096f4d467b4e09cb182cc480 (presubmit successful).