skia: add ability to load command_buffer_gles2

tests/GLProgramsTest.cpp

Index: tests/GLProgramsTest.cpp
diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index 7f23f93d34542d3127a82912cce5fb90a7a7e3ad..7bf5f2401093e1f766bdd590a28b9fe2e610adb0 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -295,6 +295,13 @@ DEF_GPUTEST(GLPrograms, reporter, factory) {
                 maxStages = 2;
             }
 #endif
+#if SK_COMMAND_BUFFER
+            // Some long shaders run out of temporary registers in the D3D compiler on ANGLE.
+            // TODO(hendrikw): This only needs to happen with the ANGLE comand buffer backend.
+            if (type == GrContextFactory::kCommandBuffer_GLContextType) {
+                maxStages = 2;
+            }
+#endif
             GrTestTarget target;
             context->getTestTarget(&target);
             REPORTER_ASSERT(reporter, target.target()->programUnitTest(context, maxStages));