Add commented out code to create a core profile on windows.

src/views/win/SkOSWindow_win.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 "SkTypes.h"
 
 #if defined(SK_BUILD_FOR_WIN)
@@ skipping 378 matching lines @@
     }
 
     if (0 == format) {
         GLuint num;
         extensions.choosePixelFormat(dc, iAttrs, fAttrs, 1, &format, &num);
         DescribePixelFormat(dc, format, sizeof(pfd), &pfd);
         BOOL set = SetPixelFormat(dc, format, &pfd);
         SkASSERT(TRUE == set);
     }
 
-    HGLRC glrc = wglCreateContext(dc);
+    HGLRC glrc = NULL;
+#if 0 // Change to 1 to attempt to create a core profile GL context of version 4.3 or lower
+    if (extensions.hasExtension(dc, "WGL_ARB_create_context")) {
+        static const GLint kCoreGLVersions[] = {
+            4, 3,
+            4, 2,
+            4, 1,
+            4, 0,
+            3, 3,
+            3, 2,
+        };
+        GLint coreProfileAttribs[] = {
+            SK_WGL_CONTEXT_MAJOR_VERSION, -1,
+            SK_WGL_CONTEXT_MINOR_VERSION, -1,
+            SK_WGL_CONTEXT_PROFILE_MASK,  SK_WGL_CONTEXT_CORE_PROFILE_BIT,
+            0,
+        };
+        for (int v = 0; v < SK_ARRAY_COUNT(kCoreGLVersions) / 2; ++v) {
+            coreProfileAttribs[1] = kCoreGLVersions[2 * v];
+            coreProfileAttribs[3] = kCoreGLVersions[2 * v + 1];
+            glrc = extensions.createContextAttribs(dc, NULL, coreProfileAttribs);
+            if (NULL != glrc) {
+                break;
+            }
+        }
+    }
+#endif
+
+    if (NULL == glrc) {
+        glrc = wglCreateContext(dc);
+    }
     SkASSERT(glrc);
 
     wglMakeCurrent(prevDC, prevGLRC);
     return glrc;
 }
 
 bool SkOSWindow::attachGL(int msaaSampleCount) {
     if (NULL == fHGLRC) {
         fHGLRC = create_gl((HWND)fHWND, msaaSampleCount);
         if (NULL == fHGLRC) {
@@ skipping 247 matching lines @@
         break;
 #endif // SK_ANGLE
 #endif // SK_SUPPORT_GPU
     default:
         SkASSERT(false);
         break;
     }
 }
 
 #endif