Revert of Remove cullRect() from PaintOpBuffer.

cc/paint/paint_op_buffer.h

Index: cc/paint/paint_op_buffer.h
diff --git a/cc/paint/paint_op_buffer.h b/cc/paint/paint_op_buffer.h
index 900eaf1e1d3817819a8a3cbdd534c6bb681a59d5..c400f51735799e7d7f3e092f54e2c8537f38954f 100644
--- a/cc/paint/paint_op_buffer.h
+++ b/cc/paint/paint_op_buffer.h
@@ -772,6 +772,7 @@ class CC_PAINT_EXPORT PaintOpBuffer : public SkRefCnt {
   static constexpr size_t PaintOpAlign = ALIGNOF(DrawDRRectOp);
 
   PaintOpBuffer();
+  explicit PaintOpBuffer(const SkRect& cull_rect);
   ~PaintOpBuffer() override;
 
   void Reset();
@@ -792,6 +793,8 @@ class CC_PAINT_EXPORT PaintOpBuffer : public SkRefCnt {
   // Resize the PaintOpBuffer to exactly fit the current amount of used space.
   void ShrinkToFit();
 
+  const SkRect& cullRect() const { return cull_rect_; }
+
   PaintOp* GetFirstOp() const {
     return const_cast<PaintOp*>(first_op_.data_as<PaintOp>());
   }
@@ -946,6 +949,7 @@ class CC_PAINT_EXPORT PaintOpBuffer : public SkRefCnt {
   // Record additional bytes used by referenced sub-records and display lists.
   size_t subrecord_bytes_used_ = 0;
   bool has_discardable_images_ = false;
+  SkRect cull_rect_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintOpBuffer);
 };