Change the color of the spinning cube on click.

mojo/examples/sample_app/gles2_client_impl.cc

Index: mojo/examples/sample_app/gles2_client_impl.cc
diff --git a/mojo/examples/sample_app/gles2_client_impl.cc b/mojo/examples/sample_app/gles2_client_impl.cc
index ca26b2d4f3dc4da0daec730e874bb297ef05f0db..1913b486e6690a8602ea34bf817adb31aa4b6f0e 100644
--- a/mojo/examples/sample_app/gles2_client_impl.cc
+++ b/mojo/examples/sample_app/gles2_client_impl.cc
@@ -7,6 +7,7 @@
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <math.h>
+#include <stdlib.h>
 
 #include "mojo/public/c/gles2/gles2.h"
 #include "ui/events/event_constants.h"
@@ -19,6 +20,10 @@ float CalculateDragDistance(const gfx::PointF& start, const Point& end) {
   return hypot(start.x() - end.x(), start.y() - end.y());
 }
 
+float GetRandomColor() {
+  return static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
+}
+
 }
 
 GLES2ClientImpl::GLES2ClientImpl(ScopedMessagePipeHandle pipe)
@@ -74,6 +79,8 @@ void GLES2ClientImpl::HandleInputEvent(const Event& event) {
           CalculateDragDistance(capture_point_, event.location()),
           delta);
 
+      cube_.set_color(GetRandomColor(), GetRandomColor(), GetRandomColor());
+
       capture_point_ = last_drag_point_ = gfx::PointF();
       RequestAnimationFrames();
     }