Issue #2985: Support loading reader view ext. page in new session

[csadilek]

Basically, a leftover from the refactoring. We used to turn on reader mode when the port connected and reader mode was active for this session. Now we have a separate page which could be loaded in a new session. When the reader extension page connect, we can simply "show" reader mode (and mark it as active for the session, but that part already worked.)

[jonalmeida]

Nice catch! ⚡

[csadilek]

bors r=jonalmeida

[codecov]

Codecov Report

Merging #6906 into master will decrease coverage by 0.11%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##             master    #6906      +/-   ##
============================================
- Coverage     77.32%   77.21%   -0.12%     
+ Complexity     4816     4722      -94     
============================================
  Files           646      634      -12     
  Lines         23569    23161     -408     
  Branches       3469     3413      -56     
============================================
- Hits          18225    17883     -342     
+ Misses         3894     3854      -40     
+ Partials       1450     1424      -26     

Impacted Files	Coverage Δ	Complexity Δ
...components/feature/readerview/ReaderViewFeature.kt	80.23% <80.00%> (+2.07%)	26.00 <1.00> (+1.00)
...onents/support/sync/telemetry/BaseGleanSyncPing.kt	100.00% <0.00%> (ø)	11.00% <0.00%> (ø%)
...s/support/webextensions/facts/WebExtensionFacts.kt
...nents/support/webextensions/WebExtensionSupport.kt
...ts/feature/syncedtabs/storage/SyncedTabsStorage.kt
...fetch/httpurlconnection/HttpURLConnectionClient.kt
...ts/support/webextensions/WebExtensionController.kt
.../syncedtabs/SyncedTabsStorageSuggestionProvider.kt
.../support/webextensions/WebExtensionPopupFeature.kt
...s/feature/syncedtabs/presenter/DefaultPresenter.kt
... and 5 more

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[bors]

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