skia: add ability to load command_buffer_gles2

dm/DM.cpp

Index: dm/DM.cpp
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 8c3b6ed084109a44aec3bbfe36863d0c3a68aab6..f5df692ca66cfce0c700bc02d8afa432f8da083a 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -388,19 +388,22 @@ static Sink* create_sink(const char* tag) {
     if (gpu_supported()) {
         typedef GrContextFactory Gr;
         const GrGLStandard api = get_gpu_api();
-        SINK("gpunull",    GPUSink, Gr::kNull_GLContextType,   api,  0, false, FLAGS_gpu_threading);
-        SINK("gpudebug",   GPUSink, Gr::kDebug_GLContextType,  api,  0, false, FLAGS_gpu_threading);
-        SINK("gpu",        GPUSink, Gr::kNative_GLContextType, api,  0, false, FLAGS_gpu_threading);
-        SINK("gpudft",     GPUSink, Gr::kNative_GLContextType, api,  0,  true, FLAGS_gpu_threading);
-        SINK("msaa4",      GPUSink, Gr::kNative_GLContextType, api,  4, false, FLAGS_gpu_threading);
-        SINK("msaa16",     GPUSink, Gr::kNative_GLContextType, api, 16, false, FLAGS_gpu_threading);
-        SINK("nvprmsaa4",  GPUSink, Gr::kNVPR_GLContextType,   api,  4, false, FLAGS_gpu_threading);
-        SINK("nvprmsaa16", GPUSink, Gr::kNVPR_GLContextType,   api, 16, false, FLAGS_gpu_threading);
+        SINK("gpunull",       GPUSink, Gr::kNull_GLContextType,          api,  0, false, FLAGS_gpu_threading);
+        SINK("gpudebug",      GPUSink, Gr::kDebug_GLContextType,         api,  0, false, FLAGS_gpu_threading);
+        SINK("gpu",           GPUSink, Gr::kNative_GLContextType,        api,  0, false, FLAGS_gpu_threading);
+        SINK("gpudft",        GPUSink, Gr::kNative_GLContextType,        api,  0,  true, FLAGS_gpu_threading);
+        SINK("msaa4",         GPUSink, Gr::kNative_GLContextType,        api,  4, false, FLAGS_gpu_threading);
+        SINK("msaa16",        GPUSink, Gr::kNative_GLContextType,        api, 16, false, FLAGS_gpu_threading);
+        SINK("nvprmsaa4",     GPUSink, Gr::kNVPR_GLContextType,          api,  4, false, FLAGS_gpu_threading);
+        SINK("nvprmsaa16",    GPUSink, Gr::kNVPR_GLContextType,          api, 16, false, FLAGS_gpu_threading);
     #if SK_ANGLE
-        SINK("angle",      GPUSink, Gr::kANGLE_GLContextType,  api,  0, false, FLAGS_gpu_threading);
+        SINK("angle",         GPUSink, Gr::kANGLE_GLContextType,         api,  0, false, FLAGS_gpu_threading);
+    #endif
+    #if SK_COMMAND_BUFFER
+        SINK("commandbuffer", GPUSink, Gr::kCommandBuffer_GLContextType, api,  0, false, FLAGS_gpu_threading);
     #endif
     #if SK_MESA
-        SINK("mesa",       GPUSink, Gr::kMESA_GLContextType,   api,  0, false, FLAGS_gpu_threading);
+        SINK("mesa",          GPUSink, Gr::kMESA_GLContextType,          api,  0, false, FLAGS_gpu_threading);
     #endif
     }