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 332fcda71c1b72966751243967f2762b4a9446c1..80e8e5ace9b9aee110232e61fd1780953e426ee7 100644
--- a/chrome/browser/extensions/extension_process_manager.h
+++ b/chrome/browser/extensions/extension_process_manager.h
@@ -36,10 +36,6 @@ class Extension;
 // track of split-mode extensions only.
 class ExtensionProcessManager : public content::NotificationObserver {
  public:
-  enum ShouldCancelSuspend {
-    CANCEL_SUSPEND,
-    DONT_CANCEL_SUSPEND
-  };
   typedef std::set<ExtensionHost*> ExtensionHostSet;
   typedef ExtensionHostSet::const_iterator const_iterator;
 
@@ -117,11 +113,8 @@ class ExtensionProcessManager : public content::NotificationObserver {
   // the count of how many outstanding "things" are keeping the page alive.
   // When this reaches 0, we will begin the process of shutting down the page.
   // "Things" include pending events, resource loads, and API calls.
-  // The |cancel_suspend| option defaults to false and indicates whether
-  // incrementing the keepalive count should prevent it from being suspended.
   int GetLazyKeepaliveCount(const extensions::Extension* extension);
-  int IncrementLazyKeepaliveCount(const extensions::Extension* extension,
-                                  ShouldCancelSuspend should_cancel_suspend);
+  int IncrementLazyKeepaliveCount(const extensions::Extension* extension);
   int DecrementLazyKeepaliveCount(const extensions::Extension* extension);
 
   void IncrementLazyKeepaliveCountForView(
@@ -139,6 +132,10 @@ class ExtensionProcessManager : public content::NotificationObserver {
   void OnNetworkRequestStarted(content::RenderViewHost* render_view_host);
   void OnNetworkRequestDone(content::RenderViewHost* render_view_host);
 
+  // Prevents |extension|'s background page from being closed and sends the
+  // onSuspendCanceled() event to it.
+  void CancelSuspend(const extensions::Extension* extension);
+
  protected:
   explicit ExtensionProcessManager(Profile* profile);