Add measurements and send-metrics to dart2js's info.

Add measurements and send-metrics to dart2js's info.

This was originally reviewed at https://codereview.chromium.org/1220043005/, but
now I have moved this to integrate it with the rest of dart2js's dumped info.
Changes from that CL include:
 - Table has been split into a reusable library
 - All of the Global/Library/CompilationUnit result nodes are gone, the data is
   now attached directly in FunctionInfo
 - I had to add a url for source-spans into measurements. In the future this
   should go higher up in the info-hierarchy.

R=johnniwinther@google.com

Committed: https://github.com/dart-lang/dart2js_info/commit/ffd03ee45f7459efd3039ff565b4d0aa2e7cd9e7

[Siggi Cherem (dart-lang), 2015-09-29 01:37:07]

sigmund@google.com changed reviewers:
+ het@google.com, johnniwinther@google.com

[Johnni Winther, 2015-10-02 10:09:49]

lgtm

https://codereview.chromium.org/1372333002/diff/1/bin/inference/client.dart
File bin/inference/client.dart (right):

https://codereview.chromium.org/1372333002/diff/1/bin/inference/client.dart#n...
bin/inference/client.dart:139: class StringEditBuffer {
This should have its own package!

https://codereview.chromium.org/1372333002/diff/1/lib/src/util.dart
File lib/src/util.dart (right):

https://codereview.chromium.org/1372333002/diff/1/lib/src/util.dart#newcode81
lib/src/util.dart:81: /// Color-highighted string used mainly to debug
invariants.
highighted -> highlighted

https://codereview.chromium.org/1372333002/diff/1/lib/src/util.dart#newcode107
lib/src/util.dart:107: sb.write(']');
indentation

[Siggi Cherem (dart-lang), 2015-10-02 17:16:17]

thanks!

https://codereview.chromium.org/1372333002/diff/1/bin/inference/client.dart
File bin/inference/client.dart (right):

https://codereview.chromium.org/1372333002/diff/1/bin/inference/client.dart#n...
bin/inference/client.dart:139: class StringEditBuffer {
On 2015/10/02 10:09:49, Johnni Winther wrote:
> This should have its own package!

:) - I moved it to it's own library for now and added a TODO

https://codereview.chromium.org/1372333002/diff/1/lib/src/util.dart
File lib/src/util.dart (right):

https://codereview.chromium.org/1372333002/diff/1/lib/src/util.dart#newcode81
lib/src/util.dart:81: /// Color-highighted string used mainly to debug
invariants.
On 2015/10/02 10:09:49, Johnni Winther wrote:
> highighted -> highlighted

Done.

https://codereview.chromium.org/1372333002/diff/1/lib/src/util.dart#newcode107
lib/src/util.dart:107: sb.write(']');
On 2015/10/02 10:09:49, Johnni Winther wrote:
> indentation

Done.

https://codereview.chromium.org/1372333002/diff/20001/lib/src/table.dart
File lib/src/table.dart (right):

https://codereview.chromium.org/1372333002/diff/20001/lib/src/table.dart#newc...
lib/src/table.dart:5: library dart2js_info.src.table;
I seem to have forgotten to include this in the first CL. This is the same table
code that we had before (you probably saw it on the first CL already), it just
lives in its own library for now.

[Siggi Cherem (dart-lang), 2015-10-02 17:16:54]

Committed patchset #2 (id:20001) manually as
ffd03ee45f7459efd3039ff565b4d0aa2e7cd9e7 (presubmit successful).