Add angle config to nanobench and make angle a default config for dm and nanobench.

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 "Benchmark.h"
@@ skipping 264 matching lines @@
         }
 
     if (FLAGS_gpu) {
         GPU_CONFIG(gpu, kNative_GLContextType, 0)
         GPU_CONFIG(msaa4, kNative_GLContextType, 4)
         GPU_CONFIG(msaa16, kNative_GLContextType, 16)
         GPU_CONFIG(nvprmsaa4, kNVPR_GLContextType, 4)
         GPU_CONFIG(nvprmsaa16, kNVPR_GLContextType, 16)
         GPU_CONFIG(debug, kDebug_GLContextType, 0)
         GPU_CONFIG(nullgpu, kNull_GLContextType, 0)
+#ifdef SK_ANGLE
+        GPU_CONFIG(angle, kANGLE_GLContextType, 0)
+#endif
     }
 #endif
 }
 
 // If bench is enabled for config, returns a Target* for it, otherwise NULL.
 static Target* is_enabled(Benchmark* bench, const Config& config) {
     if (!bench->isSuitableFor(config.backend)) {
         return NULL;
     }
 
@@ skipping 314 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif