Moved the logic of maintaining the current context to gles2 helper library.

ppapi/ppapi.gypi

+# Copyright (c) 2010 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.
+
+{
+  'variables': {
+    #
+    # ppp_entrypoints_sources is a set of source files that provide
+    # a default implementation of plugin entry-points as defined in
+    # ppp.h. Note that these source files assume that plugin is dependent
+    # on ppapi_cpp_objects target defined in ppapi.gyp.
+    #
+    # Note that we cannot compile these source files into a static library
+    # because the entry points need to be exported from the plugin.
+    #
+    'ppp_entrypoints_sources': [
+      '<(DEPTH)/ppapi/cpp/module_embedder.h',
+      '<(DEPTH)/ppapi/cpp/ppp_entrypoints.cc',
+    ],
+  },
+}
+
+# Local Variables:
+# tab-width:2
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=2 shiftwidth=2:
+