arc-bridge: Enable ARC with a command-line flag

components/arc/arc_bridge_service.h

Index: components/arc/arc_bridge_service.h
diff --git a/components/arc/arc_bridge_service.h b/components/arc/arc_bridge_service.h
index 8d23d44da7cea9fe21c00f3cbb00f2113b128f52..14fdf843374ac233bc55a017a902da2537db7ffb 100644
--- a/components/arc/arc_bridge_service.h
+++ b/components/arc/arc_bridge_service.h
@@ -13,6 +13,10 @@
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
 
+namespace base {
+class CommandLine;
+}
+
 namespace arc {
 
 // The Chrome-side service that handles ARC instances and ARC bridge creation.
@@ -84,6 +88,10 @@ class ArcBridgeService : public IPC::Listener {
   // called on the thread that this class was created on.
   static ArcBridgeService* Get();
 
+  // Return true if ARC has been enabled through a commandline
+  // switch.
+  static bool GetEnabled(const base::CommandLine* command_line);
+
   // DetectAvailability() should be called once D-Bus is available. It will
   // call CheckArcAvailability() on the session_manager. This can only be
   // called on the thread that this class was created on.