skia: Add ANGLE support on Mac

src/gpu/gl/angle/GrGLCreateANGLEInterface.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 "gl/GrGLInterface.h"
 #include "gl/GrGLAssembleInterface.h"
 #include "../ports/SkOSLibrary.h"
 
 #include <EGL/egl.h>
 
 static GrGLFuncPtr angle_get_gl_proc(void* ctx, const char name[]) {
     GrGLFuncPtr proc = (GrGLFuncPtr) GetProcedureAddress(ctx, name);
     if (proc) {
         return proc;
     }
     return eglGetProcAddress(name);
 }
 
 const GrGLInterface* GrGLCreateANGLEInterface() {
     static void* gANGLELib = nullptr;
 
     if (nullptr == gANGLELib) {
         // We load the ANGLE library and never let it go
 #if defined _WIN32
         gANGLELib = DynamicLoadLibrary("libGLESv2.dll");
+#elif defined SK_BUILD_FOR_MAC
+        gANGLELib = DynamicLoadLibrary("libGLESv2.dylib");
 #else
         gANGLELib = DynamicLoadLibrary("libGLESv2.so");
 #endif // defined _WIN32
     }
 
     if (nullptr == gANGLELib) {
         // We can't setup the interface correctly w/o the so
         return nullptr;
     }
 
     return GrGLAssembleGLESInterface(gANGLELib, angle_get_gl_proc);
 }