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

NOTREECHECKS=true
R=mtklein@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/441333003

bench/nanobench.cpp

@@ -282,6 +282,9 @@ static void create_configs(SkTDArray<Config>* configs) {
         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
 }

tools/flags/SkCommonFlags.cpp

@@ -8,7 +8,7 @@
 #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");