Include glGetMultisamplefv API

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 469 matching lines @@
     if (glVer >= GR_GL_VER(3,0) ||
         (kGLES_GrGLStandard == fStandard && fExtensions.has("GL_EXT_map_buffer_range")) ||
         (kGL_GrGLStandard == fStandard && fExtensions.has("GL_ARB_map_buffer_range"))) {
         if (nullptr == fFunctions.fMapBufferRange ||
             nullptr == fFunctions.fFlushMappedBufferRange) {
             RETURN_FALSE_INTERFACE;
         }
     }
 
     if ((kGL_GrGLStandard == fStandard &&
+         (glVer >= GR_GL_VER(3,2) || fExtensions.has("GL_ARB_texture_multisample"))) ||
+        (kGLES_GrGLStandard == fStandard && glVer >= GR_GL_VER(3,1))) {
+        if (NULL == fFunctions.fGetMultisamplefv) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
+    if ((kGL_GrGLStandard == fStandard &&
          (glVer >= GR_GL_VER(4,3) || fExtensions.has("GL_ARB_program_interface_query"))) ||
         (kGLES_GrGLStandard == fStandard && glVer >= GR_GL_VER(3,1))) {
         if (nullptr == fFunctions.fGetProgramResourceLocation) {
             RETURN_FALSE_INTERFACE
         }
     }
 
     if (kGLES_GrGLStandard == fStandard || glVer >= GR_GL_VER(4,1) ||
         fExtensions.has("GL_ARB_ES2_compatibility")) {
 #if 0 // Enable this once Chrome gives us the function ptr
@@ skipping 255 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;
 }