Add GL indirect drawing APIs

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
@@ skipping 561 matching lines @@
             }
         }    
     } else if (kGLES_GrGLStandard == fStandard) {
         if (glVer >= GR_GL_VER(3,0) || fExtensions.has("GL_EXT_instanced_arrays")) {
             if (nullptr == fFunctions.fVertexAttribDivisor) {
                 RETURN_FALSE_INTERFACE
             }
         }    
     }
 
+    if ((kGL_GrGLStandard == fStandard && glVer >= GR_GL_VER(4,3)) ||
+        (kGLES_GrGLStandard == fStandard && glVer >= GR_GL_VER(3,1))) {
+        if (NULL == fFunctions.fDrawArraysIndirect ||
+            NULL == fFunctions.fDrawElementsIndirect) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
+    if ((kGL_GrGLStandard == fStandard && glVer >= GR_GL_VER(4,3)) ||
+        (kGLES_GrGLStandard == fStandard && fExtensions.has("GL_EXT_multi_draw_indirect"))) {
+        if (NULL == fFunctions.fMultiDrawArraysIndirect ||
+            NULL == fFunctions.fMultiDrawElementsIndirect) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
     if (fExtensions.has("GL_NV_bindless_texture")) {
         if (nullptr == fFunctions.fGetTextureHandle ||
             nullptr == fFunctions.fGetTextureSamplerHandle ||
             nullptr == fFunctions.fMakeTextureHandleResident ||
             nullptr == fFunctions.fMakeTextureHandleNonResident ||
             nullptr == fFunctions.fGetImageHandle ||
             nullptr == fFunctions.fMakeImageHandleResident ||
             nullptr == fFunctions.fMakeImageHandleNonResident ||
             nullptr == fFunctions.fIsTextureHandleResident ||
             nullptr == fFunctions.fIsImageHandleResident ||
@@ skipping 140 matching lines @@
 
     if (fExtensions.has("EGL_KHR_image") || fExtensions.has("EGL_KHR_image_base")) {
         if (nullptr == fFunctions.fEGLCreateImage ||
             nullptr == fFunctions.fEGLDestroyImage) {
             RETURN_FALSE_INTERFACE
         }
     }
 
     return true;
 }