GrGLInterface: Add support for NV_framebuffer_mixed_samples

src/gpu/gl/GrGLAssembleInterface.cpp

Index: src/gpu/gl/GrGLAssembleInterface.cpp
diff --git a/src/gpu/gl/GrGLAssembleInterface.cpp b/src/gpu/gl/GrGLAssembleInterface.cpp
index c91da9e6c732fc06c9453fb8174c69e4352196d5..6a4fbe20e0b214b57f624dd15708a73688afd3ef 100644
--- a/src/gpu/gl/GrGLAssembleInterface.cpp
+++ b/src/gpu/gl/GrGLAssembleInterface.cpp
@@ -278,6 +278,10 @@ const GrGLInterface* GrGLAssembleGLInterface(void* ctx, GrGLGetProc get) {
         GET_PROC_SUFFIX(PathMemoryGlyphIndexArray, NV);
     }
 
+    if (extensions.has("GL_NV_framebuffer_mixed_samples")) {
+        GET_PROC_SUFFIX(CoverageModulation, NV);
+    }
+
     if (extensions.has("GL_EXT_debug_marker")) {
         GET_PROC_SUFFIX(InsertEventMarker, EXT);
         GET_PROC_SUFFIX(PushGroupMarker, EXT);
@@ -519,6 +523,10 @@ const GrGLInterface* GrGLAssembleGLESInterface(void* ctx, GrGLGetProc get) {
         GET_PROC_SUFFIX(PathMemoryGlyphIndexArray, NV);
     }
 
+    if (extensions.has("GL_NV_framebuffer_mixed_samples")) {
+        GET_PROC_SUFFIX(CoverageModulation, NV);
+    }
+
     interface->fStandard = kGLES_GrGLStandard;
     interface->fExtensions.swap(&extensions);