SkRecordPartialDraw with less code duplication

src/core/SkRecordDraw.cpp

Index: src/core/SkRecordDraw.cpp
diff --git a/src/core/SkRecordDraw.cpp b/src/core/SkRecordDraw.cpp
index 0117adeefaec04a2d8f85a6a8f04dbc743c46495..f7f02997dfb149045f98722546e1ec75fcb45184 100644
--- a/src/core/SkRecordDraw.cpp
+++ b/src/core/SkRecordDraw.cpp
@@ -35,15 +35,29 @@ void SkRecordDraw(const SkRecord& record,
         }
     } else {
         // Draw all ops.
-        for (SkRecords::Draw draw(canvas); draw.index() < record.count(); draw.next()) {
+        SkRecords::Draw draw(canvas);
+        for (unsigned i = 0; i < record.count(); i++) {
             if (NULL != callback && callback->abortDrawing()) {
                 return;
             }
-            record.visit<void>(draw.index(), draw);
+            record.visit<void>(i, draw);
         }
     }
 }
 
+void SkRecordPartialDraw(const SkRecord& record,
+                         SkCanvas* canvas,
+                         const SkRect& clearRect,
+                         unsigned start, unsigned stop) {
+    SkAutoCanvasRestore saveRestore(canvas, true /*save now, restore at exit*/);
+
+    stop = SkTMin(stop, record.count());
+    SkRecords::PartialDraw draw(canvas, clearRect);
+    for (unsigned i = start; i < stop; i++) {
+        record.visit<void>(i, draw);
+    }
+}
+
 namespace SkRecords {
 
 // FIXME: SkBitmaps are stateful, so we need to copy them to play back in multiple threads.