Support chrome.windows extension API events for browserless Panels.

chrome/browser/ui/panels/panel.cc

Index: chrome/browser/ui/panels/panel.cc
diff --git a/chrome/browser/ui/panels/panel.cc b/chrome/browser/ui/panels/panel.cc
index 90f4ded2cef105fd4aa850791d8110303d52c14d..2659bc7cf3f02f0bcd97fc9384f0cab910d36d98 100644
--- a/chrome/browser/ui/panels/panel.cc
+++ b/chrome/browser/ui/panels/panel.cc
@@ -9,6 +9,9 @@
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/extensions/api/tabs/tabs_constants.h"
+#include "chrome/browser/extensions/extension_panel_event_router.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/extension_window_controller.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile.h"
@@ -151,6 +154,11 @@ void Panel::Initialize(Profile* profile, const GURL& url,
 
   // Prevent the browser process from shutting down while this window is open.
   browser::StartKeepAlive();
+
+  // Send extension event about newly created panel.
+  ExtensionPanelEventRouter* event_router = GetEventRouter();
+  if (event_router)
+    event_router->OnPanelOpened(this);
 }
 
 void Panel::InitCommandState() {
@@ -181,6 +189,11 @@ void Panel::InitCommandState() {
 void Panel::OnNativePanelClosed() {
   manager()->OnPanelClosed(this);
   DCHECK(!panel_strip_);
+
+  // Send extension event about closed panel.
+  ExtensionPanelEventRouter* event_router = GetEventRouter();
+  if (event_router)
+    event_router->OnPanelClosed(this);
 }
 
 PanelManager* Panel::manager() const {
@@ -610,6 +623,11 @@ void Panel::OnActiveStateChanged(bool active) {
   if (panel_strip_)
     panel_strip_->OnPanelActiveStateChanged(this);
 
+  // Send extension event about focus change.
+  ExtensionPanelEventRouter* event_router = GetEventRouter();
+  if (event_router)
+    event_router->OnPanelActiveStatusChanged(this, active);
+
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_PANEL_CHANGED_ACTIVE_STATUS,
       content::Source<Panel>(this),
@@ -725,3 +743,9 @@ void Panel::LoadingStateChanged(bool is_loading) {
   native_panel_->UpdatePanelLoadingAnimations(is_loading);
   UpdateTitleBar();
 }
+
+ExtensionPanelEventRouter* Panel::GetEventRouter() {
+  ExtensionService* service =
+      extensions::ExtensionSystem::Get(profile())->extension_service();
+  return service ? service->GetPanelEventRouter() : NULL;
+}