Move clip off of draw target

BUG=skia:

Review URL: https://codereview.chromium.org/947443003
diff --git a/gm/yuvtorgbeffect.cpp b/gm/yuvtorgbeffect.cpp
index 37af5e6..4448265 100644
--- a/gm/yuvtorgbeffect.cpp
+++ b/gm/yuvtorgbeffect.cpp
@@ -123,7 +123,9 @@
                     GrPipelineBuilder pipelineBuilder;
                     pipelineBuilder.setRenderTarget(rt);
                     pipelineBuilder.addColorProcessor(fp);
-                    tt.target()->drawSimpleRect(&pipelineBuilder, GrColor_WHITE, viewMatrix,
+                    tt.target()->drawSimpleRect(&pipelineBuilder,
+                                                GrColor_WHITE,
+                                                viewMatrix,
                                                 renderRect);
                 }
                 x += renderRect.width() + kTestPad;