diff --git a/atom/browser/api/atom_api_browser_window.cc b/atom/browser/api/atom_api_browser_window.cc
index d3c2559c82..1d4c0de1cb 100644
--- a/atom/browser/api/atom_api_browser_window.cc
+++ b/atom/browser/api/atom_api_browser_window.cc
@@ -134,6 +134,7 @@ void BrowserWindow::Init(v8::Isolate* isolate,
   web_contents_.Reset(isolate, web_contents.ToV8());
   api_web_contents_ = web_contents.get();
   Observe(web_contents->web_contents());
+  api_web_contents_->AddObserver(this);
 
   // Keep a copy of the options for later use.
   mate::Dictionary(isolate, web_contents->GetWrapper()).Set(
@@ -175,6 +176,8 @@ BrowserWindow::~BrowserWindow() {
   if (!window_->IsClosed())
     window_->CloseContents(nullptr);
 
+  api_web_contents_->RemoveObserver(this);
+
   // Destroy the native window in next tick because the native code might be
   // iterating all windows.
   base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, window_.release());
@@ -222,6 +225,9 @@ bool BrowserWindow::OnMessageReceived(const IPC::Message& message,
   return handled;
 }
 
+void BrowserWindow::OnRendererResponsive() {
+}
+
 void BrowserWindow::WillCloseWindow(bool* prevent_default) {
   *prevent_default = Emit("close");
 }
diff --git a/atom/browser/api/atom_api_browser_window.h b/atom/browser/api/atom_api_browser_window.h
index ba23277636..bf9a4021bf 100644
--- a/atom/browser/api/atom_api_browser_window.h
+++ b/atom/browser/api/atom_api_browser_window.h
@@ -10,16 +10,13 @@
 #include <string>
 #include <vector>
 
-#include "atom/browser/api/trackable_object.h"
+#include "atom/browser/api/atom_api_web_contents.h"
 #include "atom/browser/native_window.h"
 #include "atom/browser/native_window_observer.h"
 #include "atom/common/api/atom_api_native_image.h"
 #include "atom/common/key_weak_map.h"
 #include "base/memory/weak_ptr.h"
-#include "content/public/browser/web_contents_observer.h"
-#include "native_mate/handle.h"
 #include "native_mate/persistent_dictionary.h"
-#include "ui/gfx/image/image.h"
 
 class GURL;
 
@@ -40,6 +37,7 @@ namespace api {
 
 class BrowserWindow : public mate::TrackableObject<BrowserWindow>,
                       public content::WebContentsObserver,
+                      public ExtendedWebContentsObserver,
                       public NativeWindowObserver {
  public:
   static mate::WrappableBase* New(mate::Arguments* args);
@@ -67,6 +65,9 @@ class BrowserWindow : public mate::TrackableObject<BrowserWindow>,
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* rfh) override;
 
+  // ExtendedWebContentsObserver:
+  void OnRendererResponsive() override;
+
   // NativeWindowObserver:
   void WillCloseWindow(bool* prevent_default) override;
   void WillDestroyNativeObject() override;
diff --git a/atom/browser/api/atom_api_web_contents.cc b/atom/browser/api/atom_api_web_contents.cc
index 591418d6ce..c4a4a61139 100644
--- a/atom/browser/api/atom_api_web_contents.cc
+++ b/atom/browser/api/atom_api_web_contents.cc
@@ -642,6 +642,8 @@ void WebContents::RendererResponsive(content::WebContents* source) {
   Emit("responsive");
   if ((type_ == BROWSER_WINDOW || type_ == OFF_SCREEN) && owner_window())
     owner_window()->RendererResponsive(source);
+  for (ExtendedWebContentsObserver& observer : observers_)
+    observer.OnRendererResponsive();
 }
 
 bool WebContents::HandleContextMenu(const content::ContextMenuParams& params) {
diff --git a/atom/browser/api/atom_api_web_contents.h b/atom/browser/api/atom_api_web_contents.h
index 620f1045bb..dabb2dec71 100644
--- a/atom/browser/api/atom_api_web_contents.h
+++ b/atom/browser/api/atom_api_web_contents.h
@@ -13,6 +13,7 @@
 #include "atom/browser/api/trackable_object.h"
 #include "atom/browser/common_web_contents_delegate.h"
 #include "atom/browser/ui/autofill_popup.h"
+#include "base/observer_list.h"
 #include "content/common/cursors/webcursor.h"
 #include "content/public/browser/keyboard_event_processing_result.h"
 #include "content/public/browser/web_contents.h"
@@ -52,6 +53,7 @@ namespace api {
 // Certain events are only in WebContentsDelegate, provide our own Observer to
 // dispatch those events.
 class ExtendedWebContentsObserver {
+ public:
   virtual void OnRendererResponsive() {}
 };
 
@@ -238,6 +240,13 @@ class WebContents : public mate::TrackableObject<WebContents>,
 
   WebContentsZoomController* GetZoomController() { return zoom_controller_; }
 
+  void AddObserver(ExtendedWebContentsObserver* obs) {
+    observers_.AddObserver(obs);
+  }
+  void RemoveObserver(ExtendedWebContentsObserver* obs) {
+    observers_.RemoveObserver(obs);
+  }
+
  protected:
   WebContents(v8::Isolate* isolate,
               content::WebContents* web_contents,
@@ -428,6 +437,9 @@ class WebContents : public mate::TrackableObject<WebContents>,
   // Whether to enable devtools.
   bool enable_devtools_;
 
+  // Observers of this WebContents.
+  base::ObserverList<ExtendedWebContentsObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(WebContents);
 };