Make service-view programmatically switch views

Make service-view programmatically switch views

This has the side effect of fixing most of the Polymer exceptions when switching views.

R=turnidge@google.com

Committed: https://code.google.com/p/dart/source/detail?r=33630

[turnidge, 2014-03-12 17:46:28]

lgtm w/ comments.

https://codereview.chromium.org/195763005/diff/1/runtime/bin/vmservice/client...
File runtime/bin/vmservice/client/lib/src/elements/service_view.dart (right):

https://codereview.chromium.org/195763005/diff/1/runtime/bin/vmservice/client...
runtime/bin/vmservice/client/lib/src/elements/service_view.dart:19: 
Maybe a comment saying why we build the element afresh each time instead of
relying on template if.

https://codereview.chromium.org/195763005/diff/1/runtime/bin/vmservice/client...
runtime/bin/vmservice/client/lib/src/elements/service_view.dart:34:
InstanceViewElement element = new Element.tag('instance-view');
Combine labels with identical outcomes.

case 'Array':
case 'Bool':
...
case 'String':
   blah

[Cutch, 2014-03-12 23:32:33]

Committed patchset #1 manually as r33630 (presubmit successful).