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
diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index 2dfd33f..c808183 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -282,6 +282,9 @@
         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
 }
diff --git a/tools/flags/SkCommonFlags.cpp b/tools/flags/SkCommonFlags.cpp
index beeb6ee..ca2e18c 100644
--- a/tools/flags/SkCommonFlags.cpp
+++ b/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");