Use the checked in SDK to build Observatory

Use the checked in SDK to build Observatory

BUG=
R=turnidge@google.com

Committed: https://github.com/dart-lang/sdk/commit/e07d9e89183b400a1b3230e56b971da68a8e0bd7

[Cutch, 2015-09-10 18:06:15]

johnmccutchan@google.com changed reviewers:
+ turnidge@google.com

[turnidge, 2015-09-10 18:08:16]

lgtm

[Cutch, 2015-09-10 18:15:46]

Committed patchset #2 (id:20001) manually as
e07d9e89183b400a1b3230e56b971da68a8e0bd7 (presubmit successful).

[ricow1, 2015-09-11 07:28:02]

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

[ricow1, 2015-09-11 07:28:03]

dbc, looks good, I have one suggesting to minimize issues in the future. Since
the old checked in binaries will be deprecated I think we should put the path
calculation for this into tools/utils.py so that all our tools use the same call
to get this

https://codereview.chromium.org/1337503003/diff/20001/tools/observatory_tool.py
File tools/observatory_tool.py (right):

https://codereview.chromium.org/1337503003/diff/20001/tools/observatory_tool....
tools/observatory_tool.py:30: def GetDartSdkPubExecutablePath():
how about moving this to tools/utils.py so that we have one (and only one way of
finding out about it) ?