Introduce runtime.onSuspendCanceled() event.

chrome/browser/extensions/extension_process_manager.h

Index: chrome/browser/extensions/extension_process_manager.h
diff --git a/chrome/browser/extensions/extension_process_manager.h b/chrome/browser/extensions/extension_process_manager.h
index eea12952a7f17e03f172bddf37a65fbe880fdebb..53d6ec56fad361e9294bda71ba064a0d0aa78674 100644
--- a/chrome/browser/extensions/extension_process_manager.h
+++ b/chrome/browser/extensions/extension_process_manager.h
@@ -132,6 +132,9 @@ class ExtensionProcessManager : public content::NotificationObserver {
   void OnNetworkRequestStarted(content::RenderViewHost* render_view_host);
   void OnNetworkRequestDone(content::RenderViewHost* render_view_host);
 
+  // Prevent the specified extension from being suspended.
+  void CancelSuspend(const std::string& extension_id);
+
  protected:
   explicit ExtensionProcessManager(Profile* profile);
 
@@ -185,7 +188,9 @@ class ExtensionProcessManager : public content::NotificationObserver {
   void OnLazyBackgroundPageIdle(const std::string& extension_id,
                                 int sequence_id);
   void OnLazyBackgroundPageActive(const std::string& extension_id);
-  void CloseLazyBackgroundPageNow(const std::string& extension_id);
+  void MaybePostOnLazyBackgroundPageIdle(const std::string& extension_id);
+  void CloseLazyBackgroundPageNow(const std::string& extension_id,
+                                  int sequence_id);
 
   // Updates a potentially-registered RenderViewHost once it has been
   // associated with a WebContents. This allows us to gather information that