Support using OpenGL ES context on desktop

src/gpu/gl/mac/SkNativeGLContext_mac.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/SkNativeGLContext.h"
 #include "AvailabilityMacros.h"
 
@@ skipping 14 matching lines @@
 SkNativeGLContext::~SkNativeGLContext() {
     this->destroyGLContext();
 }
 
 void SkNativeGLContext::destroyGLContext() {
     if (NULL != fContext) {
         CGLReleaseContext(fContext);
     }
 }
 
-const GrGLInterface* SkNativeGLContext::createGLContext() {
+const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedStandard) {
     SkASSERT(NULL == fContext);
+    if (kGLES_GrGLStandard == forcedStandard) {
+        return NULL;
+    }
 
     CGLPixelFormatAttribute attributes[] = {
 #if MAC_OS_X_VERSION_10_7
         kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute) kCGLOGLPVersion_3_2_Core,
 #endif
         kCGLPFADoubleBuffer,
         (CGLPixelFormatAttribute)0
     };
     CGLPixelFormatObj pixFormat;
     GLint npix;
@@ skipping 25 matching lines @@
     return interface;
 }
 
 void SkNativeGLContext::makeCurrent() const {
     CGLSetCurrentContext(fContext);
 }
 
 void SkNativeGLContext::swapBuffers() const {
     CGLFlushDrawable(fContext);
 }