Enable stencil clipping in mixed sampled render targets

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 f19a1cb0755fe042c021108019820169dbe83aaf..4c9725439049aecf47fda254a80c9cdf67a25f41 100644
--- a/src/gpu/gl/GrGLAssembleInterface.cpp
+++ b/src/gpu/gl/GrGLAssembleInterface.cpp
@@ -450,6 +450,14 @@ const GrGLInterface* GrGLAssembleGLInterface(void* ctx, GrGLGetProc get) {
         }
     }
 
+    if (glVer >= GR_GL_VER(4,3)) {
+        GET_PROC(FramebufferParameteri);
+    }
+    if (extensions.has("GL_NV_sample_locations")) {
+        GET_PROC_SUFFIX(NamedFramebufferSampleLocationsfv, NV);
+        GET_PROC_SUFFIX(GetMultisamplefv, NV);

[Chris Dalton, 2015/09/22 08:35:24]

For glGetMultisamplefv we should check for GL version 3.2, and we should also
load it for GLES version 3.1.

+    }
+
     if (glVer >= GR_GL_VER(4,3) || extensions.has("GL_KHR_debug")) {
         // KHR_debug defines these methods to have no suffix in an OpenGL (not ES) context.
         GET_PROC(DebugMessageControl);