Support ARB extensions for indirect drawing

include/gpu/gl/GrGLInterface.h

Index: include/gpu/gl/GrGLInterface.h
diff --git a/include/gpu/gl/GrGLInterface.h b/include/gpu/gl/GrGLInterface.h
index 47dfbaab20845960320ea3c852337ed8c30bf5fa..b735b8fadf7686138aa1593f676408d5e1bb210a 100644
--- a/include/gpu/gl/GrGLInterface.h
+++ b/include/gpu/gl/GrGLInterface.h
@@ -206,6 +206,8 @@ public:
         GrGLFunction<GrGLMapBufferRangeProc> fMapBufferRange;
         GrGLFunction<GrGLMapBufferSubDataProc> fMapBufferSubData;
         GrGLFunction<GrGLMapTexSubImage2DProc> fMapTexSubImage2D;
+        GrGLFunction<GrGLMultiDrawArraysIndirectProc> fMultiDrawArraysIndirect;
+        GrGLFunction<GrGLMultiDrawElementsIndirectProc> fMultiDrawElementsIndirect;
         GrGLFunction<GrGLPixelStoreiProc> fPixelStorei;
         GrGLFunction<GrGLPopGroupMarkerProc> fPopGroupMarker;
         GrGLFunction<GrGLPushGroupMarkerProc> fPushGroupMarker;
@@ -323,10 +325,6 @@ public:
         /* NV_framebuffer_mixed_samples */
         GrGLFunction<GrGLCoverageModulationProc> fCoverageModulation;
 
-        /* EXT_multi_draw_indirect */
-        GrGLFunction<GrGLMultiDrawArraysIndirectProc> fMultiDrawArraysIndirect;
-        GrGLFunction<GrGLMultiDrawElementsIndirectProc> fMultiDrawElementsIndirect;
-
         /* NV_bindless_texture */
         // We use the NVIDIA verson for now because it does not require dynamically uniform handles.
         // We may switch the the ARB version and/or omit methods in the future.