Reland r59641. Add the onBeforeNavigate and onErrorOccured events to the webNavigation API.

chrome/browser/extensions/extension_webnavigation_api.h

Index: chrome/browser/extensions/extension_webnavigation_api.h
diff --git a/chrome/browser/extensions/extension_webnavigation_api.h b/chrome/browser/extensions/extension_webnavigation_api.h
index 77182e1590e6c72ca0f9dfd0e02059ef53f6f56e..95ba03220dd3c0f39f50b426574a10d887d32b2c 100644
--- a/chrome/browser/extensions/extension_webnavigation_api.h
+++ b/chrome/browser/extensions/extension_webnavigation_api.h
@@ -12,10 +12,13 @@
 
 #include "base/singleton.h"
 #include "chrome/browser/extensions/extension_function.h"
-#include "chrome/browser/tab_contents/navigation_controller.h"
+#include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 #include "googleurl/src/gurl.h"
 
+class NavigationController;
+class ProvisionalLoadDetails;
+
 // Observes navigation notifications and routes them as events to the extension
 // system.
 class ExtensionWebNavigationEventRouter : public NotificationObserver {
@@ -36,11 +39,23 @@ class ExtensionWebNavigationEventRouter : public NotificationObserver {
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
-  // Handler for the NAV_ENTRY_COMMITTED event. The method takes the details of
-  // such an event and constructs a suitable JSON formatted extension event
-  // from it.
-  void NavEntryCommitted(NavigationController* controller,
-                         NavigationController::LoadCommittedDetails* details);
+  // Handler for the FRAME_PROVISIONAL_LOAD_START event. The method takes the
+  // details of such an event and constructs a suitable JSON formatted extension
+  // event from it.
+  void FrameProvisionalLoadStart(NavigationController* controller,
+                                 ProvisionalLoadDetails* details);
+
+  // Handler for the FRAME_PROVISIONAL_LOAD_COMMITTED event. The method takes
+  // the details of such an event and constructs a suitable JSON formatted
+  // extension event from it.
+  void FrameProvisionalLoadCommitted(NavigationController* controller,
+                                     ProvisionalLoadDetails* details);
+
+  // Handler for the FAIL_PROVISIONAL_LOAD_WITH_ERROR event. The method takes
+  // the details of such an event and constructs a suitable JSON formatted
+  // extension event from it.
+  void FailProvisionalLoadWithError(NavigationController* controller,
+                                    ProvisionalLoadDetails* details);
 
   // This method dispatches events to the extension message service.
   void DispatchEvent(Profile* context,