17615 [web] Combine duplicate platform message spy implementations (affects: tests, cla: yes, platform-web)

17742 [web] Synthesize keyup event when the browser doesn’t trigger a keyup (cla: yes, platform-web)

17933 [web] Fix exception when getting boxes for rich text range (platform-web)

17936 [web] Don’t allow empty initial route (cla: yes, platform-web, waiting for tree to go green)

18032 [web] Use correct shell operator to compare file limits (cla: yes, platform-web)

18034 [web] First batch of unit tests for line breaker (cla: yes, platform-web)

18040 [web] Add support for syncing unicode line break properties (cla: yes, platform-web)