Add new PPB_OPENGLES2_DRAWBUFFERS_DEV_INTERFACE_1_0 pepper interface.

ppapi/shared_impl/ppb_opengles2_shared.cc

Index: ppapi/shared_impl/ppb_opengles2_shared.cc
diff --git a/ppapi/shared_impl/ppb_opengles2_shared.cc b/ppapi/shared_impl/ppb_opengles2_shared.cc
index 6d291c456c9c1f883e5b16fc64d447e6a828ffde..aa335df3a734cb3f8011a4f1f1e097a9d7d49240 100644
--- a/ppapi/shared_impl/ppb_opengles2_shared.cc
+++ b/ppapi/shared_impl/ppb_opengles2_shared.cc
@@ -1566,6 +1566,13 @@ void VertexAttribDivisorANGLE(PP_Resource context_id,
   }
 }
 
+void DrawBuffersEXT(PP_Resource context_id, GLsizei count, const GLenum* bufs) {
+  Enter3D enter(context_id, true);
+  if (enter.succeeded()) {
+    ToGles2Impl(&enter)->DrawBuffersEXT(count, bufs);
+  }
+}
+
 }  // namespace
 const PPB_OpenGLES2* PPB_OpenGLES2_Shared::GetInterface() {
   static const struct PPB_OpenGLES2 ppb_opengles2 = {
@@ -1680,4 +1687,10 @@ const PPB_OpenGLES2Query* PPB_OpenGLES2_Shared::GetQueryInterface() {
       &EndQueryEXT,   &GetQueryivEXT,    &GetQueryObjectuivEXT};
   return &ppb_opengles2;
 }
+const PPB_OpenGLES2DrawBuffers_Dev*
+PPB_OpenGLES2_Shared::GetDrawBuffersInterface() {  // NOLINT
+  static const struct PPB_OpenGLES2DrawBuffers_Dev ppb_opengles2 = {
+      &DrawBuffersEXT};
+  return &ppb_opengles2;
+}
 }  // namespace ppapi