Merge pull request #20150 from eliperelman/bug-837668-implement-loading-events-dialer

Bug 837668 - Implementing new startup loading events in Dialer app
Conflicts:
	tests/performance/startup_events_test.js
Merge pull request #20464 from jrburke/bug837677-email-startup-events

Bug 837677 - [e-mail] Implement new startup loading events r=mcav
Conflicts:
	tests/performance/startup_events_test.js
Merge pull request #21237 from KevinGrandon/bug_1032933_search_marketplace_icon

Bug 1032933 - [Search] Use closest icon size for marketplace results
Merge pull request #21267 from Cwiiis/bug1031287-squashed

Bug 1031287 - Fix removing transitions from cards in task manager. r=alive