Optionally pass rendertarget to getTestTarget

tests/GLProgramsTest.cpp

Index: tests/GLProgramsTest.cpp
diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index ce247df59cd03cbde666f40da45d161e344337f6..47a88fcbb5786c19e6ad2f7ee8ea2d20f6b8f02e 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -357,7 +357,7 @@ bool GrDrawingManager::ProgramUnitTest(GrContext* context, int maxStages) {
         set_random_stencil(&pipelineBuilder, &random);
 
         GrTestTarget tt;
-        context->getTestTarget(&tt);
+        context->getTestTarget(&tt, rt);
 
         tt.target()->drawBatch(pipelineBuilder, batch);
     }
@@ -391,7 +391,7 @@ bool GrDrawingManager::ProgramUnitTest(GrContext* context, int maxStages) {
             builder.addColorFragmentProcessor(blockFP);
 
             GrTestTarget tt;
-            context->getTestTarget(&tt);
+            context->getTestTarget(&tt, rt);
 
             tt.target()->drawBatch(builder, batch);
             drawingManager->flush();