demo_launcher/lib/main.dart does not have bottom-overscroll

demo_launcher/lib/main.dart does not have bottom-overscroll

Rather than trying to clamp the scroll offset during scrolling, we detect when
we might have exceeded our maxScrollOffset and settle the scroll offset back in
bounds.

Fixes #287

R=eseidel@chromium.org, eseidel@google.com

Committed: https://chromium.googlesource.com/external/mojo/+/286f85649eb39cd9de1858ff94d3cd1ab64b185d

[Hixie, 2015-07-09 20:39:38]

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

[Hixie, 2015-07-09 20:39:38]

lgtm

[eseidel, 2015-07-09 20:40:07]

eseidel@chromium.org changed reviewers:
+ eseidel@chromium.org
- ianh@google.com

[eseidel, 2015-07-09 20:40:08]

lgtm

https://codereview.chromium.org/1226373003/diff/1/sky/sdk/lib/widgets/fixed_h...
File sky/sdk/lib/widgets/fixed_height_scrollable.dart (right):

https://codereview.chromium.org/1226373003/diff/1/sky/sdk/lib/widgets/fixed_h...
sky/sdk/lib/widgets/fixed_height_scrollable.dart:43: _updateScrollOffset();
Unneeded.

[abarth-chromium, 2015-07-09 20:43:35]

Committed patchset #1 (id:1) manually as
286f85649eb39cd9de1858ff94d3cd1ab64b185d (presubmit successful).