Add a couple functions to package:stack_trace.

Add a couple functions to package:stack_trace.

This adds a function to convert a Trace to a VM-style StackTrace
object, and to parse a Trace-style string into a Trace.

R=jmesserly@google.com

Committed: https://code.google.com/p/dart/source/detail?r=24611

[Jennifer Messerly, 2013-06-28 21:48:07]

lgtm

https://codereview.chromium.org/18029023/diff/1/pkg/stack_trace/lib/src/utils...
File pkg/stack_trace/lib/src/utils.dart (right):

https://codereview.chromium.org/18029023/diff/1/pkg/stack_trace/lib/src/utils...
pkg/stack_trace/lib/src/utils.dart:5: library utils;
do we still have an issue with library names? maybe this should be
stack_trace.src.utils?

https://codereview.chromium.org/18029023/diff/1/pkg/stack_trace/lib/src/vm_tr...
File pkg/stack_trace/lib/src/vm_trace.dart (right):

https://codereview.chromium.org/18029023/diff/1/pkg/stack_trace/lib/src/vm_tr...
pkg/stack_trace/lib/src/vm_trace.dart:15: class VmTrace implements StackTrace {
VMTrace?

[nweiz, 2013-06-28 22:23:54]

https://codereview.chromium.org/18029023/diff/1/pkg/stack_trace/lib/src/utils...
File pkg/stack_trace/lib/src/utils.dart (right):

https://codereview.chromium.org/18029023/diff/1/pkg/stack_trace/lib/src/utils...
pkg/stack_trace/lib/src/utils.dart:5: library utils;
On 2013/06/28 21:48:07, John Messerly wrote:
> do we still have an issue with library names? maybe this should be
> stack_trace.src.utils?

Now that this is run on dart2js, you're probably right. I really hate the
pattern of "duplicate the filename in the library name", but I don't want to
punish users of the library with spurious warnings. Done.

Maybe we should just start putting UUIDs in here.

https://codereview.chromium.org/18029023/diff/1/pkg/stack_trace/lib/src/vm_tr...
File pkg/stack_trace/lib/src/vm_trace.dart (right):

https://codereview.chromium.org/18029023/diff/1/pkg/stack_trace/lib/src/vm_tr...
pkg/stack_trace/lib/src/vm_trace.dart:15: class VmTrace implements StackTrace {
On 2013/06/28 21:48:07, John Messerly wrote:
> VMTrace?

Done.

[nweiz, 2013-06-28 22:24:13]

Committed patchset #2 manually as r24611 (presubmit successful).