Add widget to display errors, and report dependency_graph errors correctly

Add widget to display errors, and report graph errors correctly.

This fixes the compiler so that all error messages in dependency_graph are reported via the reporter and unifies how errors are constructed in other places as well. With all errors reported together, we use a widget (adapted from polymer) to display the error messages as part of the app in server mode.

R=vsm@google.com

Committed: https://github.com/dart-lang/dev_compiler/commit/33503c554e71cae6b2834802e5873043361987fb

[Siggi Cherem (dart-lang), 2015-03-07 02:25:48]

Patchset #1 (id:1) has been deleted

[Siggi Cherem (dart-lang), 2015-03-07 02:25:52]

Patchset #1 (id:20001) has been deleted

[Siggi Cherem (dart-lang), 2015-03-07 02:31:40]

Patchset #1 (id:40001) has been deleted

[Siggi Cherem (dart-lang), 2015-03-07 02:31:47]

Patchset #1 (id:60001) has been deleted

[Siggi Cherem (dart-lang), 2015-03-07 02:43:00]

sigmund@google.com changed reviewers:
+ jmesserly@google.com, vsm@google.com

[Siggi Cherem (dart-lang), 2015-03-07 02:43:02]

(FYI - this CL is built on top of others, I'm only showing the diff of what's
new in CL that is not already in the others ongoing CLS)

https://codereview.chromium.org/988483006/diff/80001/lib/runtime/messages.css
File lib/runtime/messages.css (right):

https://codereview.chromium.org/988483006/diff/80001/lib/runtime/messages.css...
lib/runtime/messages.css:1: /** Copyright (c) 2015, the Dart project authors. 
Please see the AUTHORS file
this CSS was copied from the widget that we have in polymer, it's identical to
what Jake and I had originally written

https://codereview.chromium.org/988483006/diff/80001/lib/runtime/messages_wid...
File lib/runtime/messages_widget.dart (right):

https://codereview.chromium.org/988483006/diff/80001/lib/runtime/messages_wid...
lib/runtime/messages_widget.dart:1: // Copyright (c) 2015, the Dart project
authors.  Please see the AUTHORS file
this is adapted from the code in polymer. Simplified a bit and adjusted to use
the messages.json that we already produce in our summary reporter.

https://codereview.chromium.org/988483006/diff/80001/lib/runtime/messages_wid...
File lib/runtime/messages_widget.js (right):

https://codereview.chromium.org/988483006/diff/80001/lib/runtime/messages_wid...
lib/runtime/messages_widget.js:1: // Generated by dart2js, the Dart to
JavaScript compiler version: 1.9.0-dev.10.3.
this is generated from the previous file. Just submitting it for now until DDC
can handle compiling the previous file on its own.

https://codereview.chromium.org/988483006/diff/80001/lib/src/checker/resolver...
File lib/src/checker/resolver.dart (right):

https://codereview.chromium.org/988483006/diff/80001/lib/src/checker/resolver...
lib/src/checker/resolver.dart:83: reporter.log(message);
I am unifying the error reporting using the new [Message] class

https://codereview.chromium.org/988483006/diff/80001/lib/src/report.dart
File lib/src/report.dart (left):

https://codereview.chromium.org/988483006/diff/80001/lib/src/report.dart#oldc...
lib/src/report.dart:136: /// Summary information computed by the DDC checker.
note: these deletions are actually code that moved to summary.dart. I had to
import it from a client library, so I had to decouple it from the rest of the
compiler

https://codereview.chromium.org/988483006/diff/80001/lib/src/summary.dart
File lib/src/summary.dart (right):

https://codereview.chromium.org/988483006/diff/80001/lib/src/summary.dart#new...
lib/src/summary.dart:10: /// Summary information computed by the DDC checker.
most of this file is unmodified except that I added HtmlSummary for html files.
This meant changes to:
- serialize/parse them (only in GlobalSummary.loose)
- build them (added HtmlSummary type)
- and share code with LibrarySummary (added IndividualSummary as a shared
interface)

[vsm, 2015-03-09 15:14:36]

lgtm

https://codereview.chromium.org/988483006/diff/80001/lib/src/checker/resolver...
File lib/src/checker/resolver.dart (right):

https://codereview.chromium.org/988483006/diff/80001/lib/src/checker/resolver...
lib/src/checker/resolver.dart:83: reporter.log(message);
On 2015/03/07 02:43:01, Siggi Cherem (dart-lang) wrote:
> I am unifying the error reporting using the new [Message] class

Nice!

[Siggi Cherem (dart-lang), 2015-03-09 18:37:27]

Committed patchset #1 (id:80001) manually as
33503c554e71cae6b2834802e5873043361987fb (presubmit successful).