This is similar to --package-warnings, except that diagnostics will
only be reported for Dart packages matching the given prefix.
Also added the number of source files analyzed and the number of
errors generated to performance report.
Cleanup: simplified code for triggering diet parsing.
BUG=
R=paulberry@google.com
Review URL: https://codereview.chromium.org/1806263004 .
1.13 stable builds of the SDK contain a version of server that fails catastrophically when analyzing source that imports packages that define embedded libraries. Since we can't pragmatically require more recent SDKs for flutter development we have been prevented from landing embedded libs in the flutter engine. By renaming the key we use to identify contributed libraries, this change avoids the issue. Old versions of server will simply ignore the new key and new ones will process it properly. Win-win!
BUG=
R=danrubel@google.com
Review URL: https://codereview.chromium.org/1643023002 .
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