Add support for managing active state of platform apps

chrome/browser/ui/base_window.h

Index: chrome/browser/ui/base_window.h
diff --git a/chrome/browser/ui/base_window.h b/chrome/browser/ui/base_window.h
index 1adc021575b900e5de2e1eca68ccdb1985b34d3f..76c4dde89e79b06bfa8ebb8c6ac435592a1e400b 100644
--- a/chrome/browser/ui/base_window.h
+++ b/chrome/browser/ui/base_window.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "base/compiler_specific.h"
+#include "ui/gfx/native_widget_types.h"
 
 namespace gfx {
 class Rect;
@@ -31,6 +32,9 @@ class BaseWindow {
   // Returns true if the window is full screen.
   virtual bool IsFullscreen() const = 0;
 
+  // Return a platform dependent identifier for this window.
+  virtual gfx::NativeWindow GetNativeWindow() = 0;
+
   // Returns the nonmaximized bounds of the window (even if the window is
   // currently maximized or minimized) in terms of the screen coordinates.
   virtual gfx::Rect GetRestoredBounds() const = 0;