[Gin] Add V8NoTurbo experiment to disable Ignition+TurboFan.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 262ca22a17dafdaaf988794fe64d9b93b08ab987..59dbfcdfa29c8e1da51214d1f4bfb562c615ffdc 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -98854,6 +98854,7 @@ from previous Chrome versions.
   <int value="-1041650038" label="enable-forced-migration-to-tabbed-mode"/>
   <int value="-1039889738" label="NativeNotifications:enabled"/>
   <int value="-1039555838" label="GamepadExtensions:enabled"/>
+  <int value="-1034344165" label="V8NoTurbo:disabled"/>
   <int value="-1033738911" label="enable-mac-views-dialogs"/>
   <int value="-1028733699" label="MacViewsWebUIDialogs:disabled"/>
   <int value="-1022971520" label="enable-search-button-in-omnibox-for-str"/>
@@ -99368,6 +99369,7 @@ from previous Chrome versions.
   <int value="1205849612" label="enable-sync-synced-notifications"/>
   <int value="1209221384" label="enable-experimental-accessibility-features"/>
   <int value="1210343926" label="enable-drop-sync-credential"/>
+  <int value="1211284676" label="V8NoTurbo:enabled"/>
   <int value="1219628795" label="PrintScaling:disabled"/>
   <int value="1219826373" label="ServiceWorkerNavigationPreload:enabled"/>
   <int value="1220171692" label="SpeculativeLaunchServiceWorker:enabled"/>