add roundOut that returns its result

src/utils/debugger/SkDebugCanvas.cpp

Index: src/utils/debugger/SkDebugCanvas.cpp
diff --git a/src/utils/debugger/SkDebugCanvas.cpp b/src/utils/debugger/SkDebugCanvas.cpp
index b07b383781a3d584b155fcd4fcc8f5ee6fdd485c..95256e7d1331624843939f56dada79e7f3aa729d 100644
--- a/src/utils/debugger/SkDebugCanvas.cpp
+++ b/src/utils/debugger/SkDebugCanvas.cpp
@@ -42,8 +42,7 @@ SkDebugCanvas::SkDebugCanvas(int windowWidth, int windowHeight)
     largeIRect.inset(1024, 1024);
     SkRect large = SkRect::Make(largeIRect);
 #ifdef SK_DEBUG
-    large.roundOut(&largeIRect);
-    SkASSERT(!largeIRect.isEmpty());
+    SkASSERT(!large.roundOut().isEmpty());
 #endif
     // call the base class' version to avoid adding a draw command
     this->INHERITED::onClipRect(large, SkRegion::kReplace_Op, kHard_ClipEdgeStyle);