Support ARB extensions for indirect drawing

src/gpu/gl/GrGLInterface.cpp

Index: src/gpu/gl/GrGLInterface.cpp
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index 4e6ad0861168eadf7a998042c95b06f4b6e04ac8..76886015e0fd840ac174f3924befc5865e0b8d8d 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -600,7 +600,8 @@ bool GrGLInterface::validate() const {
         }
     }
 
-    if ((kGL_GrGLStandard == fStandard && glVer >= GR_GL_VER(4,3)) ||
+    if ((kGL_GrGLStandard == fStandard &&
+         (glVer >= GR_GL_VER(4,0) || fExtensions.has("GL_ARB_draw_indirect"))) ||
         (kGLES_GrGLStandard == fStandard && glVer >= GR_GL_VER(3,1))) {
         if (NULL == fFunctions.fDrawArraysIndirect ||
             NULL == fFunctions.fDrawElementsIndirect) {
@@ -608,7 +609,8 @@ bool GrGLInterface::validate() const {
         }
     }
 
-    if ((kGL_GrGLStandard == fStandard && glVer >= GR_GL_VER(4,3)) ||
+    if ((kGL_GrGLStandard == fStandard &&
+         (glVer >= GR_GL_VER(4,3) || fExtensions.has("GL_ARB_multi_draw_indirect"))) ||
         (kGLES_GrGLStandard == fStandard && fExtensions.has("GL_EXT_multi_draw_indirect"))) {
         if (NULL == fFunctions.fMultiDrawArraysIndirect ||
             NULL == fFunctions.fMultiDrawElementsIndirect) {