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

tools/flags/SkCommonFlags.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 "SkCommonFlags.h"
 #include "SkThreadPool.h"
 
-DEFINE_string(config, "565 8888 pdf gpu nonrendering",
+DEFINE_string(config, "565 8888 pdf gpu nonrendering angle",
               "Options: 565 8888 pdf gpu nonrendering msaa4 msaa16 nvprmsaa4 nvprmsaa16 "
               "gpunull gpudebug angle mesa");
 
 DEFINE_bool(cpu, true, "master switch for running CPU-bound work.");
 
 DEFINE_bool(dryRun, false,
             "just print the tests that would be run, without actually running them.");
 
 DEFINE_bool(gpu, true, "master switch for running GPU-bound work.");
 
@@ skipping 23 matching lines @@
 DEFINE_bool2(single, z, false, "run tests on a single thread internally.");
 
 DEFINE_string(skps, "", "Directory to read skps from.");
 
 DEFINE_int32(threads, SkThreadPool::kThreadPerCore,
              "run threadsafe tests on a threadpool with this many threads.");
 
 DEFINE_bool2(verbose, v, false, "enable verbose output from the test driver.");
 
 DEFINE_bool2(veryVerbose, V, false, "tell individual tests to be verbose.");