Closes #3310: browser-engine-gecko-nightly: Automatically recover and restore if content process is killed.

removed ellipsize from titleView.
added fading for titleView (same as urlView)

changed tests for DisplayToolBar and BrowserToolbar

removed ellipsize from titleView.
added fading for titleView (same as urlView)

added test for DisplayToolBar and BrowserToolbar

reader view.

The context for this is bug 1566368: this is needed in order
for the glean parsers to generate an API to route batched
streaming telemetry calls to the Glean SDK.

This also changes the Glean error reporting mechanism to support
reporting multiple errors of the same type in one call.

the SessionSuggestionProvider.

This reverts commit fc1bc2da7c1cd5200687bde55d864ce47302acb1.