Add Pepper support for several GL extensions

ppapi/lib/gl/gles2/gl2ext_ppapi.h

Index: ppapi/lib/gl/gles2/gl2ext_ppapi.h
diff --git a/ppapi/lib/gl/gles2/gl2ext_ppapi.h b/ppapi/lib/gl/gles2/gl2ext_ppapi.h
index fcfabd8d12fcb9b0b1dbb9e957eee102dd7deba3..45eac1a227007d6aa61601664753894105f48f0c 100644
--- a/ppapi/lib/gl/gles2/gl2ext_ppapi.h
+++ b/ppapi/lib/gl/gles2/gl2ext_ppapi.h
@@ -12,6 +12,7 @@
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/ppb.h"
 #include "ppapi/c/ppb_opengles2.h"
+#include "ppapi/c/dev/ppb_opengles2ext_dev.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -36,6 +37,16 @@ GL_APICALL PP_Resource GL_APIENTRY glGetCurrentContextPPAPI();
 
 // Returns OpenGL ES 2.0 interface.
 GL_APICALL const struct PPB_OpenGLES2* GL_APIENTRY glGetInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2InstancedArrays_Dev* GL_APIENTRY
+    glGetInstancedArraysInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2FramebufferBlit_Dev* GL_APIENTRY
+    glGetFramebufferBlitInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2FramebufferMultisample_Dev* GL_APIENTRY
+    glGetFramebufferMultisampleInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2ChromiumEnableFeature_Dev* GL_APIENTRY
+    glGetChromiumEnableFeatureInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2ChromiumMapSub_Dev* GL_APIENTRY
+    glGetChromiumMapSubInterfacePPAPI();
 
 #ifdef __cplusplus
 }