Add support for text styles.

Add support for text styles.

This is a completion of Hans's WIP patch:
https://codereview.chromium.org/1176133002/

Makes it possible for us to style text in fn2 apps.

The title style in the toolbar doesn't look quite right
but as far as I can tell its the same color as the
old typography code produced.  Will need further investigation.

Fixes #213

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

Committed: https://chromium.googlesource.com/external/mojo/+/66b6706007ef9b4a3b1ae22d39cd6c49eb70c4ce

[jackson, 2015-06-12 01:32:49]

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

[jackson, 2015-06-12 01:32:50]

lgtm

I think hixie had some comments on the original

note that stocks test is failing

https://codereview.chromium.org/1178913003/diff/1/sky/sdk/lib/framework/rende...
File sky/sdk/lib/framework/rendering/paragraph.dart (right):

https://codereview.chromium.org/1178913003/diff/1/sky/sdk/lib/framework/rende...
sky/sdk/lib/framework/rendering/paragraph.dart:20: int
trueTypeWeightNumber(FontWeight weight) {
This global function might make sense as a getter on TextStyle (if you want to
make it public) or you could just put it in paint if you're only going to use it
once.

https://codereview.chromium.org/1178913003/diff/1/sky/sdk/lib/framework/rende...
sky/sdk/lib/framework/rendering/paragraph.dart:150: 'rgba(${c.red}, ${c.green},
${c.blue}, ${c.alpha / 255.0 })';
you've got an extra space here

[eseidel, 2015-06-12 01:36:28]

PTAL

[abarth-chromium, 2015-06-12 03:11:16]

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

[abarth-chromium, 2015-06-12 03:11:17]

lgtm

https://codereview.chromium.org/1178913003/diff/60001/sky/sdk/lib/framework/r...
File sky/sdk/lib/framework/rendering/paragraph.dart (right):

https://codereview.chromium.org/1178913003/diff/60001/sky/sdk/lib/framework/r...
sky/sdk/lib/framework/rendering/paragraph.dart:39: TextStyle copyWith({
In BoxConstraints, we call a similar function "apply".  I like copyWith better. 
Would you be willing to change BoxConstraints in a followup CL?

https://codereview.chromium.org/1178913003/diff/60001/sky/sdk/lib/framework/r...
sky/sdk/lib/framework/rendering/paragraph.dart:180: cssStyle['font-weight'] = {
const {

That will make the map a compile-time constant.

https://codereview.chromium.org/1178913003/diff/60001/sky/sdk/lib/framework/r...
sky/sdk/lib/framework/rendering/paragraph.dart:187: cssStyle['text-align'] = {
const {

[eseidel, 2015-06-12 19:29:44]

Landed as 66b6706007ef9b4a3b1ae22d39cd6c49eb70c4ce