Add 'will-finish-launching' event for app.

browser/api/atom_api_app.cc

@@ -36,6 +36,10 @@ void App::OnOpenFile(bool* prevent_default, const std::string& file_path) {
   *prevent_default = Emit("open-file", &args);
 }
 
+void App::OnWillFinishLaunching() {
+  Emit("will-finish-launching");
+}
+
 void App::OnFinishLaunching() {
   Emit("finish-launching");
 }

browser/api/atom_api_app.h

@@ -28,6 +28,7 @@ class App : public EventEmitter,
   virtual void OnWindowAllClosed() OVERRIDE;
   virtual void OnOpenFile(bool* prevent_default,
                           const std::string& file_path) OVERRIDE;
+  virtual void OnWillFinishLaunching() OVERRIDE;
   virtual void OnFinishLaunching() OVERRIDE;
 
  private:

browser/atom_application_delegate_mac.mm

@@ -10,6 +10,10 @@
 
 @implementation AtomApplicationDelegate
 
+- (void)applicationWillFinishLaunching:(NSNotification*)notify {
+  atom::Browser::Get()->WillFinishLaunching();
+}
+
 - (void)applicationDidFinishLaunching:(NSNotification*)notify {
   // Trap the quit message to handleQuitEvent.
   NSAppleEventManager* em = [NSAppleEventManager sharedAppleEventManager];

browser/atom_browser_main_parts.cc

@@ -72,6 +72,7 @@ void AtomBrowserMainParts::PreMainMessageLoopRun() {
 
 #if !defined(OS_MACOSX)
   // The corresponding call in OS X is in AtomApplicationDelegate.
+  Browser::Get()->WillFinishLaunching();
   Browser::Get()->DidFinishLaunching();
 #endif
 }

browser/browser.cc

@@ -41,6 +41,10 @@ bool Browser::OpenFile(const std::string& file_path) {
   return prevent_default;
 }
 
+void Browser::WillFinishLaunching() {
+  FOR_EACH_OBSERVER(BrowserObserver, observers_, OnWillFinishLaunching());
+}
+
 void Browser::DidFinishLaunching() {
   FOR_EACH_OBSERVER(BrowserObserver, observers_, OnFinishLaunching());
 }

browser/browser.h

@@ -34,6 +34,7 @@ class Browser : public WindowListObserver {
   bool OpenFile(const std::string& file_path);
 
   // Tell the application the loading has been done.
+  void WillFinishLaunching();
   void DidFinishLaunching();
 
   void AddObserver(BrowserObserver* obs) {

browser/browser_observer.h

@@ -24,6 +24,7 @@ class BrowserObserver {
                           const std::string& file_path) {}
 
   // The browser has finished loading.
+  virtual void OnWillFinishLaunching() {}
   virtual void OnFinishLaunching() {}
 
  protected: