Change the color of the spinning cube on click.

mojo/examples/sample_app/gles2_client_impl.cc

 // Copyright 2013 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 "mojo/examples/sample_app/gles2_client_impl.h"
 
 #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"
 
 namespace mojo {
 namespace examples {
 namespace {
 
 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)
     : getting_animation_frames_(false) {
   context_ = MojoGLES2CreateContext(
       pipe.release().value(),
       &ContextLostThunk,
       &DrawAnimationFrameThunk,
       this);
   MojoGLES2MakeCurrent(context_);
@@ skipping 35 matching lines @@
     }
     break;
   case ui::ET_MOUSE_RELEASED:
   case ui::ET_TOUCH_RELEASED: {
       MojoTimeTicks offset = GetTimeTicksNow() - drag_start_time_;
       float delta = static_cast<float>(offset) / 1000000.;
       cube_.SetFlingMultiplier(
           CalculateDragDistance(capture_point_, event.location()),
           delta);
 
+      cube_.set_color(GetRandomColor(), GetRandomColor(), GetRandomColor());
+
       capture_point_ = last_drag_point_ = gfx::PointF();
       RequestAnimationFrames();
     }
     break;
   default:
     break;
   }
 }
 
 void GLES2ClientImpl::ContextLost() {
@@ skipping 25 matching lines @@
   last_time_ = GetTimeTicksNow();
 }
 
 void GLES2ClientImpl::CancelAnimationFrames() {
   getting_animation_frames_ = false;
   MojoGLES2CancelAnimationFrames(context_);
 }
 
 }  // namespace examples
 }  // namespace mojo