Add Pepper support for several GL extensions

ppapi/shared_impl/ppb_opengles2_shared.h

Index: ppapi/shared_impl/ppb_opengles2_shared.h
diff --git a/ppapi/shared_impl/ppb_opengles2_shared.h b/ppapi/shared_impl/ppb_opengles2_shared.h
index 2b4c9f9110c5a9b0f21581c1b5f73023a30b1be4..5cc1493837d5425896a97f87e3d9f2f59b81e94b 100644
--- a/ppapi/shared_impl/ppb_opengles2_shared.h
+++ b/ppapi/shared_impl/ppb_opengles2_shared.h
@@ -6,6 +6,7 @@
 #define PPAPI_SHARED_IMPL_PPB_OPENGLES2_SHARED_H_
 
 #include "ppapi/c/ppb_opengles2.h"
+#include "ppapi/c/dev/ppb_opengles2ext_dev.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
@@ -13,6 +14,13 @@ namespace ppapi {
 class PPAPI_SHARED_EXPORT PPB_OpenGLES2_Shared {
  public:
   static const PPB_OpenGLES2* GetInterface();
+  static const PPB_OpenGLES2InstancedArrays_Dev* GetInstancedArraysInterface();
+  static const PPB_OpenGLES2FramebufferBlit_Dev* GetFramebufferBlitInterface();
+  static const PPB_OpenGLES2FramebufferMultisample_Dev*
+      GetFramebufferMultisampleInterface();
+  static const PPB_OpenGLES2ChromiumEnableFeature_Dev*
+      GetChromiumEnableFeatureInterface();
+  static const PPB_OpenGLES2ChromiumMapSub_Dev* GetChromiumMapSubInterface();
 };
 
 }  // namespace ppapi