Fix tools/full-coverage.dart script and add standalone test

Fix tools/full-coverage.dart script and add standalone test.

Test checks coverage data of a given script and differentiates between:
* no coverage data
* no hits (IC=0)
* some hits (IC>0)

BUG=
R=iposva@google.com

Committed: https://code.google.com/p/dart/source/detail?r=37571

[Michael Lippautz (Google), 2014-06-19 01:31:05]

unittest and path work and make the life easier here. I will rewrite if needed.

[Ivan Posva, 2014-06-20 18:27:16]

https://codereview.chromium.org/348473004/diff/80001/tests/standalone/full_co...
File tests/standalone/full_coverage_test.dart (right):

https://codereview.chromium.org/348473004/diff/80001/tests/standalone/full_co...
tests/standalone/full_coverage_test.dart:55: ];
Are you planning to add more tests? Such as tests with closures and similar?

https://codereview.chromium.org/348473004/diff/80001/tests/standalone/full_co...
tests/standalone/full_coverage_test.dart:62: join(testDir.path,
coverageProg["name"]))
It is really confusing to be using these top-level functions from imported
packages without a prefix on the import.

[Michael Lippautz (Google), 2014-06-20 19:31:45]

https://codereview.chromium.org/348473004/diff/80001/tests/standalone/full_co...
File tests/standalone/full_coverage_test.dart (right):

https://codereview.chromium.org/348473004/diff/80001/tests/standalone/full_co...
tests/standalone/full_coverage_test.dart:55: ];
On 2014/06/20 18:27:16, Ivan Posva wrote:
> Are you planning to add more tests? Such as tests with closures and similar?

Added a test covering closures.

https://codereview.chromium.org/348473004/diff/80001/tests/standalone/full_co...
tests/standalone/full_coverage_test.dart:62: join(testDir.path,
coverageProg["name"]))
On 2014/06/20 18:27:16, Ivan Posva wrote:
> It is really confusing to be using these top-level functions from imported
> packages without a prefix on the import.

Done.

[Ivan Posva, 2014-06-20 23:15:50]

LGTM -ip

[Michael Lippautz (Google), 2014-06-20 23:25:10]

Committed patchset #3 manually as r37571 (presubmit successful).