Make async waiter explicit MojoGLES2CreateContext param

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 "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 
 namespace examples {
 namespace {
 
 float CalculateDragDistance(const mojo::Point& start, const mojo::Point& end) {
   return hypot(static_cast<float>(start.x - end.x),
                static_cast<float>(start.y - end.y));
 }
 
 float GetRandomColor() {
   return static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
 }
 
 }
 
 GLES2ClientImpl::GLES2ClientImpl(mojo::CommandBufferPtr command_buffer)
     : last_time_(mojo::GetTimeTicksNow()), waiting_to_draw_(false) {
-  context_ = MojoGLES2CreateContext(
-      command_buffer.PassMessagePipe().release().value(),
-      &ContextLostThunk,
-      this);
+  context_ =
+      MojoGLES2CreateContext(command_buffer.PassMessagePipe().release().value(),
+                             &ContextLostThunk,
+                             this,
+                             mojo::Environment::GetDefaultAsyncWaiter());
   MojoGLES2MakeCurrent(context_);
 }
 
 GLES2ClientImpl::~GLES2ClientImpl() {
   MojoGLES2DestroyContext(context_);
 }
 
 void GLES2ClientImpl::SetSize(const mojo::Size& size) {
   size_ = size;
   if (size_.width == 0 || size_.height == 0)
@@ skipping 80 matching lines @@
   float delta = static_cast<float>(offset) / 1000000.;
   last_time_ = now;
   cube_.UpdateForTimeDelta(delta);
   cube_.Draw();
 
   MojoGLES2SwapBuffers();
   WantToDraw();
 }
 
 }  // namespace examples