Merge pull request #8049 from asutherland/email-progress-candybar-on-timeout

Bug 834653 - [EMAIL] Message list synchronization progress bar should become indeterminate/show "candybar" state after a timeout since last progress bar update. r=squib(cherry picked from commit 83d98dc9b6fd0322bf5ec79f9dcc5269e6034f1a)
Bug 834653 - [EMAIL] Message list synchronization progress bar should become indeterminate/show "candybar" state after a timeout since last progress bar update. v1.0.1 specific building blocks style fix.

Visual design really wants this to look like it does on master.  For risk
reasons, we are manually copying the file into the e-mail repo (and its
images) so that we don't cause any weird fallout in other apps.  This is
basically what the automated build mechanism does, so this isn't a huge deal.

Requested in https://bugzilla.mozilla.org/show_bug.cgi?id=834653#c16
Merge pull request #8092 from asutherland/email-fork-progress-css-v1.0.1

Bug 834653 - [EMAIL] Message list synchronization progress bar should become indeterminate/show "candybar" state after a timeout since last progress bar update. v1.0.1 landing. a=akeybl for v1.0.1 landing