Add browser-global GCMDriver

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index 90a2cf6feb5ebaaaf92b61810851e0eec59f6256..ed3e110d479e60cc0ae23002f4c2402d044acadf 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -54,6 +54,10 @@ namespace extensions {
 class EventRouterForwarder;
 }
 
+namespace gcm {
+class GCMDriver;
+}
+
 namespace message_center {
 class MessageCenter;
 }
@@ -225,6 +229,8 @@ class BrowserProcess {
 
   virtual network_time::NetworkTimeTracker* network_time_tracker() = 0;
 
+  virtual gcm::GCMDriver* gcm_driver() = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserProcess);
 };