Support using OpenGL ES context on desktop

src/gpu/gl/mesa/SkMesaGLContext.cpp

Index: src/gpu/gl/mesa/SkMesaGLContext.cpp
diff --git a/src/gpu/gl/mesa/SkMesaGLContext.cpp b/src/gpu/gl/mesa/SkMesaGLContext.cpp
index 0199d12c1964e3efa067705a816a215d3e93cfa8..c9cdef7f0b6a210133ff36a8331900ddf6406429 100644
--- a/src/gpu/gl/mesa/SkMesaGLContext.cpp
+++ b/src/gpu/gl/mesa/SkMesaGLContext.cpp
@@ -53,7 +53,11 @@ void SkMesaGLContext::destroyGLContext() {
 
 static const GrGLint gBOGUS_SIZE = 16;
 
-const GrGLInterface* SkMesaGLContext::createGLContext() {
+const GrGLInterface* SkMesaGLContext::createGLContext(GrGLStandard forcedStandard) {
+    if (kGLES_GrGLStandard == forcedStandard) {
+        return NULL;
+    }
+
     /* Create an RGBA-mode context */
 #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
     /* specify Z, stencil, accum sizes */