This change adds an UI element that displays messages registered with
the MessageOfTheDay extension point. The messages will be displayed
below the main navigation header. This functionality was already part
of the GWT-UI, but was never migrated to the new UI.
The messages can be dismissed by a button click, that will create a
cookie that will prevent the message from being displayed again until
the redisplay time configured with the message.
The content of the message can be HTML. Depending on where the message-
content is coming from, this might be harmful. In case of the
messageoftheday plugin, the message is added as a config from the Gerrit
server site, which can probably be considered save. However, in a future
change rendering HTML should be made configurable and switched off by
default. Text should then be rendered using `gr-formatted-text`.
Change-Id: I2cbbcbcd49734b645701b9fac62a016a269d37f2
1fbf53df60