Added restore functionality for maximize full/left/right

ash/wm/custom_frame_view_ash.cc

Index: ash/wm/custom_frame_view_ash.cc
diff --git a/ash/wm/custom_frame_view_ash.cc b/ash/wm/custom_frame_view_ash.cc
index aa0186d3e3ae6ba7aa324b3732b2e703a92ce9f7..f1d6f8529157d34861b6ad676ca4a0495ce0bdeb 100644
--- a/ash/wm/custom_frame_view_ash.cc
+++ b/ash/wm/custom_frame_view_ash.cc
@@ -5,6 +5,7 @@
 #include "ash/wm/custom_frame_view_ash.h"
 
 #include "ash/wm/frame_painter.h"
+#include "ash/wm/window_util.h"
 #include "ash/wm/workspace/frame_maximize_button.h"
 #include "grit/ui_resources.h"
 #include "grit/ui_strings.h"  // Accessibility names
@@ -148,10 +149,7 @@ void CustomFrameViewAsh::ButtonPressed(views::Button* sender,
   if (sender == maximize_button_) {
     // The maximize button may move out from under the cursor.
     ResetWindowControls();
-    if (frame_->IsMaximized())
-      frame_->Restore();
-    else
-      frame_->Maximize();
+    ash::wm::ToggleMaximizedState(frame_->GetNativeWindow());
     // |this| may be deleted - some windows delete their frames on maximize.
   } else if (sender == close_button_) {
     frame_->Close();