Unrevert 152017 - Add chrome.runtime.onStartup, which is fired on browser start.

chrome/browser/extensions/api/runtime/runtime_api.h

Index: chrome/browser/extensions/api/runtime/runtime_api.h
diff --git a/chrome/browser/extensions/api/runtime/runtime_api.h b/chrome/browser/extensions/api/runtime/runtime_api.h
index e24c3a8f8cf93bc3e770e6a3a80dff5fcbb4c1e3..ed4aabd2501a98f016dddd53341d00f4de4f41c8 100644
--- a/chrome/browser/extensions/api/runtime/runtime_api.h
+++ b/chrome/browser/extensions/api/runtime/runtime_api.h
@@ -15,6 +15,10 @@ class ExtensionHost;
 
 class RuntimeEventRouter {
  public:
+  // Dispatches the onStartup event to all currently-loaded extensions.
+  static void DispatchOnStartupEvent(Profile* profile,
+                                     const std::string& extension_id);
+
   // Dispatches the onInstalled event to the given extension.
   static void DispatchOnInstalledEvent(Profile* profile,
                                        const std::string& extension_id);