added support for glMinSampleShading

src/gpu/gl/GrGLTestInterface.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLTestInterface_DEFINED
 #define GrGLTestInterface_DEFINED
 
@@ skipping 95 matching lines @@
     virtual GrGLvoid invalidateSubFramebuffer(GrGLenum target, GrGLsizei numAttachments, const GrGLenum *attachments, GrGLint x, GrGLint y, GrGLsizei width, GrGLsizei height) {}
     virtual GrGLvoid invalidateTexImage(GrGLuint texture, GrGLint level) {}
     virtual GrGLvoid invalidateTexSubImage(GrGLuint texture, GrGLint level, GrGLint xoffset, GrGLint yoffset, GrGLint zoffset, GrGLsizei width, GrGLsizei height, GrGLsizei depth) {}
     virtual GrGLboolean isTexture(GrGLuint texture) { return GR_GL_FALSE; }
     virtual GrGLvoid lineWidth(GrGLfloat width) {}
     virtual GrGLvoid linkProgram(GrGLuint program) {}
     virtual GrGLvoid* mapBuffer(GrGLenum target, GrGLenum access) { return nullptr; }
     virtual GrGLvoid* mapBufferRange(GrGLenum target, GrGLintptr offset, GrGLsizeiptr length, GrGLbitfield access) { return nullptr; }
     virtual GrGLvoid* mapBufferSubData(GrGLuint target, GrGLintptr offset, GrGLsizeiptr size, GrGLenum access) { return nullptr; }
     virtual GrGLvoid* mapTexSubImage2D(GrGLenum target, GrGLint level, GrGLint xoffset, GrGLint yoffset, GrGLsizei width, GrGLsizei height, GrGLenum format, GrGLenum type, GrGLenum access) { return nullptr; }
+    virtual GrGLvoid minSampleShading(GrGLfloat value) {}    
     virtual GrGLvoid pixelStorei(GrGLenum pname, GrGLint param) {}
     virtual GrGLvoid popGroupMarker() {}
     virtual GrGLvoid pushGroupMarker(GrGLsizei length, const char* marker) {}
     virtual GrGLvoid queryCounter(GrGLuint id, GrGLenum target) {}
     virtual GrGLvoid rasterSamples(GrGLuint samples, GrGLboolean fixedsamplelocations) {}
     virtual GrGLvoid readBuffer(GrGLenum src) {}
     virtual GrGLvoid readPixels(GrGLint x, GrGLint y, GrGLsizei width, GrGLsizei height, GrGLenum format, GrGLenum type, GrGLvoid* pixels) {}
     virtual GrGLvoid renderbufferStorage(GrGLenum target, GrGLenum internalformat, GrGLsizei width, GrGLsizei height) {}
     virtual GrGLvoid renderbufferStorageMultisample(GrGLenum target, GrGLsizei samples, GrGLenum internalformat, GrGLsizei width, GrGLsizei height) {}
     virtual GrGLvoid resolveMultisampleFramebuffer() {}
@@ skipping 197 matching lines @@
     // This must be called by leaf class
     void init(GrGLStandard standard) {
         fStandard = standard;
         fExtensions.init(standard, fFunctions.fGetString, fFunctions.fGetStringi,
                          fFunctions.fGetIntegerv, nullptr, GR_EGL_NO_DISPLAY);
     }
     GrGLTestInterface();
 };
 
 #endif