Make back button control drawer in stocks app

Make back button control drawer in stocks app

Currently you lose your scroll and drawer state when coming back from the settings pane.
I think we should solve this by having the Navigator maintain a Stack and
keeping the StockHome alive underneath it. But this is good enough for a first iteration.

R=abarth@chromium.org, abarth

Committed: https://chromium.googlesource.com/external/mojo/+/0c8edcaef8f3714b7ddfade37290f00ba2fc43f3

[abarth-chromium, 2015-06-18 22:24:00]

lgtm

https://codereview.chromium.org/1191153002/diff/20001/sky/examples/stocks2/li...
File sky/examples/stocks2/lib/stock_app.dart (right):

https://codereview.chromium.org/1191153002/diff/20001/sky/examples/stocks2/li...
sky/examples/stocks2/lib/stock_app.dart:20: });
Technically we should do this stock fetcher stuff in onMount.  It doesn't
actually matter because the App is mounted exactly once.

https://codereview.chromium.org/1191153002/diff/20001/sky/examples/stocks2/li...
sky/examples/stocks2/lib/stock_app.dart:22: _navState = new NavigationState([
s/_navState/_navigationState/

Please use complete words in variable names.

https://codereview.chromium.org/1191153002/diff/20001/sky/examples/stocks2/li...
File sky/examples/stocks2/lib/stock_home.dart (right):

https://codereview.chromium.org/1191153002/diff/20001/sky/examples/stocks2/li...
sky/examples/stocks2/lib/stock_home.dart:154: navigator.pushState("/drawer",
(route) {
If you ignore arguments, the convention is to use the name _

[jackson, 2015-06-18 22:36:10]

Committed patchset #5 (id:80001) manually as
0c8edcaef8f3714b7ddfade37290f00ba2fc43f3 (presubmit successful).