ServiceWorker: Implement StartWorker by using mojo

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 1740a34375e414b794d9cac1b04edb4f1b170bb2..8214c0c03998aef13ff8916380a1def91879f567 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -653,6 +653,9 @@ const char kMHTMLSkipNostoreAll[]           = "skip-nostore-all";
 // Use a Mojo-based LocalStorage implementation.
 const char kMojoLocalStorage[]              = "mojo-local-storage";
 
+// Use a Mojo-based ServiceWorker implementation.
+const char kMojoServiceWorker[]             = "mojo-service-worker";
+
 // Mutes audio sent to the audio device so it is not audible during
 // automated testing.
 const char kMuteAudio[]                     = "mute-audio";