Replace GrGLInterface's function pointers with std::functions

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 
@@ skipping 651 matching lines @@
         if (!hasChromiumPathRendering &&
             ctxInfo.version() < GR_GL_VER(3, 1)) {
             return false;
         }
     }
     // We only support v1.3+ of GL_NV_path_rendering which allows us to
     // set individual fragment inputs with ProgramPathFragmentInputGen. The API
     // additions are detected by checking the existence of the function.
     // We also use *Then* functions that not all drivers might have. Check
     // them for consistency.
-    if (nullptr == gli->fFunctions.fStencilThenCoverFillPath ||
-        nullptr == gli->fFunctions.fStencilThenCoverStrokePath ||
-        nullptr == gli->fFunctions.fStencilThenCoverFillPathInstanced ||
-        nullptr == gli->fFunctions.fStencilThenCoverStrokePathInstanced ||
-        nullptr == gli->fFunctions.fProgramPathFragmentInputGen) {
+    if (!gli->fFunctions.fStencilThenCoverFillPath ||
+        !gli->fFunctions.fStencilThenCoverStrokePath ||
+        !gli->fFunctions.fStencilThenCoverFillPathInstanced ||
+        !gli->fFunctions.fStencilThenCoverStrokePathInstanced ||
+        !gli->fFunctions.fProgramPathFragmentInputGen) {
         return false;
     }
     return true;
 }
 
 bool GrGLCaps::readPixelsSupported(GrPixelConfig rtConfig,
                                    GrPixelConfig readConfig,
                                    std::function<void (GrGLenum, GrGLint*)> getIntegerv,
                                    std::function<bool ()> bindRenderTarget) const {
     // If it's not possible to even have a render target of rtConfig then read pixels is
@@ skipping 977 matching lines @@
         for (int j = 0; j < kExternalFormatUsageCnt; ++j) {
             SkASSERT(defaultEntry.fFormats.fExternalFormat[j] !=
                      fConfigTable[i].fFormats.fExternalFormat[j]);
         }
         SkASSERT(defaultEntry.fFormats.fExternalType != fConfigTable[i].fFormats.fExternalType);
     }
 #endif
 }
 
 void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}