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..b37a169a050c5ccd209fccf5aa5dabfc33ff043e 100644
--- a/chrome/browser/extensions/extension_process_manager.h
+++ b/chrome/browser/extensions/extension_process_manager.h
@@ -120,6 +120,10 @@ class ExtensionProcessManager : public content::NotificationObserver {
   void IncrementLazyKeepaliveCountForView(
       content::RenderViewHost* render_view_host);
 
+  // Notifies an extension that it won't be unloaded after all if it is in the
+  // process of being unloaded.
+  void CancelSuspend(const extensions::Extension* extension);
+
   // Handles a response to the ShouldUnload message, used for lazy background
   // pages.
   void OnShouldUnloadAck(const std::string& extension_id, int sequence_id);
@@ -185,7 +189,8 @@ 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 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