Create separate entry points for the various flavors of drawRect

gm/constcolorprocessor.cpp

Index: gm/constcolorprocessor.cpp
diff --git a/gm/constcolorprocessor.cpp b/gm/constcolorprocessor.cpp
index 26898be3bd5acd673553006f84167d69bd8d23b4..9177ce5233d73e41c94fba2a916e296a5a86dc11 100644
--- a/gm/constcolorprocessor.cpp
+++ b/gm/constcolorprocessor.cpp
@@ -115,10 +115,10 @@ protected:
                     GrPipelineBuilder pipelineBuilder(grPaint, rt, clip);
                     pipelineBuilder.addColorProcessor(fp);
 
-                    tt.target()->drawSimpleRect(pipelineBuilder,
-                                                grPaint.getColor(),
-                                                viewMatrix,
-                                                renderRect);
+                    tt.target()->drawBWRect(pipelineBuilder,
+                                            grPaint.getColor(),
+                                            viewMatrix,
+                                            renderRect);
 
                     // Draw labels for the input to the processor and the processor to the right of
                     // the test rect. The input label appears above the processor label.