Bug 1496506 - Flip the pref for the new about:performance r=florian,baku

This activates by default the new about:performance page and its underlying
counters in Firefox

MozReview-Commit-ID: LccL6zBHUHm

Differential Revision: https://phabricator.services.mozilla.com/D7884

--HG--
extra : moz-landing-system : lando

modules/libpref/init/StaticPrefList.h

@@ -200,7 +200,7 @@ VARCACHE_PREF(
 VARCACHE_PREF(
   "dom.performance.enable_scheduler_timing",
   dom_performance_enable_scheduler_timing,
-  RelaxedAtomicBool, false
+  RelaxedAtomicBool, true
 )
 
 // If true. then the service worker interception and the ServiceWorkerManager

modules/libpref/init/all.js

@@ -171,7 +171,7 @@ pref("dom.enable_performance_navigation_timing", true);
 pref("dom.performance.enable_notify_performance_timing", false);
 
 // Enable collecting of docgroup activity in the scheduler
-pref("dom.performance.enable_scheduler_timing", false);
+pref("dom.performance.enable_scheduler_timing", true);
 
 // Enable Permission API's .revoke() method
 pref("dom.permissions.revoke.enable", false);
@@ -5070,7 +5070,7 @@ pref("extensions.webextensions.ExtensionStorageIDB.enabled", false);
 #endif
 
 // if enabled, store execution times for API calls
-pref("extensions.webextensions.enablePerformanceCounters", false);
+pref("extensions.webextensions.enablePerformanceCounters", true);
 
 // Maximum age in milliseconds of performance counters in children
 // When reached, the counters are sent to the main process and

toolkit/components/aboutperformance/tests/browser/browser.ini

@@ -6,4 +6,4 @@ support-files =
   browser_compartments_script.js
 
 [browser_aboutperformance.js]
-skip-if = (os == 'linux' && asan) || (verify && !debug && (os == 'linux'))
+skip-if = true