Add a missing dependency on the collection package.

Properly report load errors and increase browser timeouts.

Fix a crash when skipping tests because their platforms don't match.

Reporter improvements.

Limit the number of test suites loaded at once.

Improve VM syntax error handling and fix a few bugs.

Don't resolve symlinks on Windows to find the SDK.

Platform.executable doesn't include the ".exe" extension on Windows,
which causes symlink resolution for it to fail.

Closes dart-lang#133

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1165313002.

Darty browser traces.