Add new attention state to launcher

ui/base/animation/tween.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/animation/tween.h"
 
 #include <math.h>
 
 #if defined(OS_WIN)
 #include <float.h>
@@ skipping 24 matching lines @@
     case LINEAR:
       return state;
 
     case EASE_OUT_SNAP:
       state = 0.95 * (1.0 - pow(1.0 - state, 2));
       return state;
 
     case EASE_OUT:
       return 1.0 - pow(1.0 - state, 2);
 
+    case SMOOTH_IN_OUT:
+      return sin(state);
+
     case ZERO:
       return 0;
   }
 
   NOTREACHED();
   return state;
 }
 
 // static
 double Tween::ValueBetween(double value, double start, double target) {
@@ skipping 63 matching lines @@
                          start_transform.matrix().get(row, col),
                          end_transform.matrix().get(row, col)));
       }
     }
   }
 
   return to_return;
 }
 
 }  // namespace ui