Use a pseudo-extension CHROMIUM_framebuffer_mixed_samples

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 523 matching lines @@
             }
         }
     }
 
     if (fExtensions.has("GL_EXT_raster_multisample")) {
         if (nullptr == fFunctions.fRasterSamples) {
             RETURN_FALSE_INTERFACE
         }
     }
 
-    if (fExtensions.has("GL_NV_framebuffer_mixed_samples")) {
+    if (fExtensions.has("GL_NV_framebuffer_mixed_samples") ||
+        fExtensions.has("GL_CHROMIUM_framebuffer_mixed_samples")) {
         if (nullptr == fFunctions.fCoverageModulation) {
             RETURN_FALSE_INTERFACE
         }
     }
 
     if (kGL_GrGLStandard == fStandard) {
         if (glVer >= GR_GL_VER(3,1) ||
             fExtensions.has("GL_EXT_draw_instanced") || fExtensions.has("GL_ARB_draw_instanced")) {
             if (nullptr == fFunctions.fDrawArraysInstanced ||
                 nullptr == fFunctions.fDrawElementsInstanced) {
@@ skipping 176 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;
 }