Add missing #includes of <algorithm> in ppapi for std::min/max

ppapi/examples/2d/scroll.cc

 // Copyright (c) 2011 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 <math.h>
 
+#include <algorithm>
+
 #include "ppapi/cpp/graphics_2d.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/rect.h"
 #include "ppapi/cpp/var.h"
 #include "ppapi/utility/completion_callback_factory.h"
 #include "ppapi/utility/graphics/paint_manager.h"
 
 static const int kSquareSpacing = 98;
@@ skipping 94 matching lines @@
 };
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp