Add validation check that linewidth func is present (we already call it on ES).

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 72 matching lines @@
 #endif
         NULL == fGetError ||
         NULL == fGetIntegerv ||
         NULL == fGetProgramInfoLog ||
         NULL == fGetProgramiv ||
         NULL == fGetShaderInfoLog ||
         NULL == fGetShaderiv ||
         NULL == fGetString ||
         NULL == fGetUniformLocation ||
         NULL == fLinkProgram ||
+        NULL == fLineWidth ||
         NULL == fPixelStorei ||
         NULL == fReadPixels ||
         NULL == fScissor ||
         NULL == fShaderSource ||
         NULL == fStencilFunc ||
         NULL == fStencilMask ||
         NULL == fStencilOp ||
         NULL == fTexImage2D ||
         NULL == fTexParameteri ||
         NULL == fTexParameteriv ||
@@ skipping 163 matching lines @@
     if (kDesktop_GrGLBinding != binding ||
         (glVer >= GR_GL_VER(1,3)) ||
         extensions.has("GL_ARB_texture_compression")) {
         if (NULL == fCompressedTexImage2D) {
             return false;
         }
     }
 
     // part of desktop GL, but not ES
     if (kDesktop_GrGLBinding == binding &&
-        (NULL == fLineWidth ||
-         NULL == fGetTexLevelParameteriv ||
+        (NULL == fGetTexLevelParameteriv ||
          NULL == fDrawBuffer ||
          NULL == fReadBuffer)) {
         return false;
     }
 
     // GL_EXT_texture_storage is part of desktop 4.2
     // There is a desktop ARB extension and an ES+desktop EXT extension
     if (kDesktop_GrGLBinding == binding) {
         if (glVer >= GR_GL_VER(4,2) ||
             extensions.has("GL_ARB_texture_storage") ||
@@ skipping 94 matching lines @@
             if (NULL == fBindVertexArray ||
                 NULL == fDeleteVertexArrays ||
                 NULL == fGenVertexArrays) {
                 return false;
             }
         }
     }
 
     return true;
 }