Change the color of the spinning cube on click.

mojo/examples/sample_app/spinning_cube.h

Index: mojo/examples/sample_app/spinning_cube.h
diff --git a/mojo/examples/sample_app/spinning_cube.h b/mojo/examples/sample_app/spinning_cube.h
index 9cd78b8f899ca8bbe1e7b1ba858dd012b7962a4e..9f7cdc427a687e5365e337139f9c5764acfcc955 100644
--- a/mojo/examples/sample_app/spinning_cube.h
+++ b/mojo/examples/sample_app/spinning_cube.h
@@ -19,6 +19,11 @@ class SpinningCube {
 
   void Init(uint32_t width, uint32_t height);
   void set_direction(int direction) { direction_ = direction; }
+  void set_color(float r, float g, float b) {
+    color_[0] = r;
+    color_[1] = g;
+    color_[2] = b;
+  }
   void SetFlingMultiplier(float drag_distance, float drag_time);
   void UpdateForTimeDelta(float delta_time);
   void UpdateForDragDistance(float distance);
@@ -37,6 +42,7 @@ class SpinningCube {
   scoped_ptr<GLState> state_;
   float fling_multiplier_;
   int direction_;
+  float color_[3];
 };
 
 }  // namespace examples