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..1aa0fe2eea9fe9b1781e8b92b02d22a53556dbb8 100644
--- a/ppapi/lib/gl/gles2/gl2ext_ppapi.h
+++ b/ppapi/lib/gl/gles2/gl2ext_ppapi.h
@@ -36,6 +36,16 @@ 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* GL_APIENTRY
+    glGetInstancedArraysInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2FramebufferBlit* GL_APIENTRY
+    glGetFramebufferBlitInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2FramebufferMultisample* GL_APIENTRY
+    glGetFramebufferMultisampleInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2ChromiumEnableFeature* GL_APIENTRY
+    glGetChromiumEnableFeatureInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2ChromiumMapSub* GL_APIENTRY
+    glGetChromiumMapSubInterfacePPAPI();
 
 #ifdef __cplusplus
 }