Don't modify the clipstack in saveLayer() if the kClipToLayer_SaveFlag is

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index ed8274dc5d3b4a9bf09d6241541620b1a11f9a4f..ecc05ac90097841479b2d7b56275deaefeed5094 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -820,12 +820,12 @@ bool SkCanvas::clipRectBounds(const SkRect* bounds, SaveFlags flags,
         ir = clipBounds;
     }
 
-    fClipStack.clipDevRect(ir, op);
-
-    // early exit if the clip is now empty
-    if (bounds_affects_clip(flags) &&
-        !fMCRec->fRasterClip->op(ir, op)) {
-        return false;
+    if (bounds_affects_clip(flags)) {
+        fClipStack.clipDevRect(ir, op);
+        // early exit if the clip is now empty
+        if (!fMCRec->fRasterClip->op(ir, op)) {
+            return false;
+        }
     }
 
     if (intersection) {