Commits on Jul 7, 2017

1. fix(aio): activate ServiceWorker updates asap …

   Previouly, whenever a new ServiceWorker update was detected the user was
   prompted to update (with a notification). This turned out to be more distracting
   than helpful. Also, one would get notifications on all open browser tabs/windows
   and had to manually reload each one in order for the whole content (including
   the app) to be updated.
   
   This commit changes the update strategy as follows:
   - Whenever a new update is detected, it is immediately activated (and all
     tabs/windows will be notified).
   - Once an update is activated (regardless of whether the activation was
     initiated by the current tab/window or not), a flag will be set to do a
     "full page navigation" the next time the user navigates to a document.
   
   Benefits:
   - All tabs/windows are updated asap.
   - The updates are applied authomatically, without the user's needing to do
     anything.
   - The updates are applied in a way that:
     a. Ensures that the app and content versions are always compatible.
     b. Does not distract the user from their usual workflow.
   
   NOTE:
   The "full page navigation" may cause a flash (while the page is loading from
   scratch), but this is expected to be minimal, since at that point almost all
   necessary resources are cached by and served from the ServiceWorker.
   
   Fixes angular#17539

   

   gkalpak committed Jul 7, 2017
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