skia: add ability to load command_buffer_gles2

bench/nanobench.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <ctype.h>
 
 #include "nanobench.h"
@@ skipping 425 matching lines @@
         GPU_CONFIG(msaa4, kNative_GLContextType, 4, false)
         GPU_CONFIG(msaa16, kNative_GLContextType, 16, false)
         GPU_CONFIG(nvprmsaa4, kNVPR_GLContextType, 4, false)
         GPU_CONFIG(nvprmsaa16, kNVPR_GLContextType, 16, false)
         GPU_CONFIG(gpudft, kNative_GLContextType, 0, true)
         GPU_CONFIG(debug, kDebug_GLContextType, 0, false)
         GPU_CONFIG(nullgpu, kNull_GLContextType, 0, false)
 #ifdef SK_ANGLE
         GPU_CONFIG(angle, kANGLE_GLContextType, 0, false)
 #endif
+#ifdef SK_COMMAND_BUFFER
+        GPU_CONFIG(commandbuffer, kCommandBuffer_GLContextType, 0, false)
+#endif
 #if SK_MESA
         GPU_CONFIG(mesa, kMESA_GLContextType, 0, false)
 #endif
     }
 #endif
 
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
     if (is_cpu_config_allowed("hwui")) {
         Config config = { "hwui", Benchmark::kHWUI_Backend, kRGBA_8888_SkColorType,
                           kPremul_SkAlphaType, 0, kBogusGLContextType, false };
@@ skipping 700 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif