win: Add "balloon-clicked" event for Tray

atom/browser/ui/win/notify_icon.cc

@@ -71,6 +71,10 @@ void NotifyIcon::HandleClickEvent(const gfx::Point& cursor_pos,
       ui::MENU_SOURCE_MOUSE));
 }
 
+void NotifyIcon::HandleBalloonClickEvent() {
+  NotifyBalloonClicked();
+}
+
 void NotifyIcon::ResetIcon() {
   NOTIFYICONDATA icon_data;
   InitIconData(&icon_data);

atom/browser/ui/win/notify_icon.h

@@ -35,6 +35,9 @@ class NotifyIcon : public TrayIcon {
   // otherwise displays the context menu if there is one.
   void HandleClickEvent(const gfx::Point& cursor_pos, bool left_button_click);
 
+  // Handles a click on the balloon from the user.
+  void HandleBalloonClickEvent();
+
   // Re-creates the status tray icon now after the taskbar has been created.
   void ResetIcon();
 

atom/browser/ui/win/notify_icon_host.cc

@@ -132,6 +132,10 @@ LRESULT CALLBACK NotifyIconHost::WndProc(HWND hwnd,
       return TRUE;
 
     switch (lparam) {
+      case TB_INDETERMINATE:
+        win_icon->HandleBalloonClickEvent();
+        return TRUE;
+
       case WM_LBUTTONDOWN:
       case WM_RBUTTONDOWN:
       case WM_CONTEXTMENU: