Added <spark-dialog> example
Merge pull request #2318 from ussuri/widget-examples-2

Fix and expand widget examples
clone dialog: #2248
Merge pull request #2344 from dart-lang/dialog_submit

Allow overriding onSubmit event in dialogs.
Fix typo in prev commit
Fixed #2350: disabled buttons in dart2js version too
Fixed #2354: show indeterminate progress bar
add hyperlinking for html and css
Merge pull request #2355 from dinhviethoa/2354-fix-indeterminate-progress-bar

Show indeterminate progress bar properly in dart2js
nits
Merge remote-tracking branch 'upstream/master' into 2248-clone-dialog
Merge pull request #2345 from dart-lang/refactor_clone

[maintenance] Refactor clone
Merge pull request #2311 from dart-lang/fix_git_branch

Disable creating sub-branches from remoteBranches.
fix an npe
added todo
Merge pull request #2320 from dart-lang/disable_sync

Disable syncfs
Merge pull request #2353 from dinhviethoa/2350-button-disabled-dart2js

Disabled buttons in dart2js version too
Merge pull request #2357 from devoncarew/devoncarew_npe

fix an npe
Cleanup of dialogs
Merge pull request #2349 from dinhviethoa/2248-clone-dialog

clone dialog UX improvements