adding events to notify fullscreen state

atom/browser/api/atom_api_window.cc

@@ -132,6 +132,14 @@ void Window::OnWindowLeaveFullScreen() {
   Emit("leave-full-screen");
 }
 
+void Window::OnWindowEnterHtmlFullScreen() {
+  Emit("enter-html-full-screen");
+}
+
+void Window::OnWindowLeaveHtmlFullScreen() {
+  Emit("leave-html-full-screen");
+}
+
 void Window::OnRendererUnresponsive() {
   Emit("unresponsive");
 }

atom/browser/api/atom_api_window.h

@@ -66,6 +66,8 @@ class Window : public mate::EventEmitter,
   void OnWindowRestore() override;
   void OnWindowEnterFullScreen() override;
   void OnWindowLeaveFullScreen() override;
+  void OnWindowEnterHtmlFullScreen() override;
+  void OnWindowLeaveHtmlFullScreen() override;
   void OnRendererUnresponsive() override;
   void OnRendererResponsive() override;
   void OnDevToolsFocus() override;

atom/browser/native_window.cc

@@ -700,10 +700,14 @@ void NativeWindow::RendererResponsive(content::WebContents* source) {
 void NativeWindow::EnterFullscreenModeForTab(content::WebContents* source,
                                              const GURL& origin) {
   SetHtmlApiFullscreen(true);
+  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
+                    OnWindowEnterHtmlFullScreen());
 }
 
 void NativeWindow::ExitFullscreenModeForTab(content::WebContents* source) {
   SetHtmlApiFullscreen(false);
+  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
+                    OnWindowLeaveHtmlFullScreen());
 }
 
 bool NativeWindow::IsFullscreenForTabOrPending(

atom/browser/native_window_observer.h

@@ -49,6 +49,8 @@ class NativeWindowObserver {
   virtual void OnWindowRestore() {}
   virtual void OnWindowEnterFullScreen() {}
   virtual void OnWindowLeaveFullScreen() {}
+  virtual void OnWindowEnterHtmlFullScreen() {}
+  virtual void OnWindowLeaveHtmlFullScreen() {}
 
   // Called when devtools window gets focused.
   virtual void OnDevToolsFocus() {}

docs/api/browser-window.md

@@ -179,6 +179,14 @@ Emitted when window enters full screen state.
 
 Emitted when window leaves full screen state.
 
+### Event: 'enter-html-full-screen'
+
+Emitted when window enters full screen state triggered by html api.
+
+### Event: 'leave-html-full-screen'
+
+Emitted when window leaves full screen state triggered by html api.
+
 ### Event: 'devtools-opened'
 
 Emitted when devtools is opened.