Start to propagate constness of GrPipelineBuilder up the stack

tests/GLProgramsTest.cpp

Index: tests/GLProgramsTest.cpp
diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index 7eb5315166fd468947f10663ccf1da5a8e99bc37..d21ae5d4cd8f0d16ca4d13ec48a8b54a7ed364cb 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -251,7 +251,7 @@ bool GrDrawTarget::programUnitTest(GrContext* context, int maxStages) {
         set_random_state(&pipelineBuilder, &random);
         set_random_stencil(&pipelineBuilder, &random);
 
-        this->drawBatch(&pipelineBuilder, batch);
+        this->drawBatch(pipelineBuilder, batch);
     }
 
     // Flush everything, test passes if flush is successful(ie, no asserts are hit, no crashes)