cc: Renamed approximate{BytesUsed,OpCount} in paint op buffer.

cc/paint/transform_display_item.h

Index: cc/paint/transform_display_item.h
diff --git a/cc/paint/transform_display_item.h b/cc/paint/transform_display_item.h
index a75db2a4d87ea70a9e0b87f241979c62c5e8a632..50c2358d783bb57884b09b9b12954528b85ae40d 100644
--- a/cc/paint/transform_display_item.h
+++ b/cc/paint/transform_display_item.h
@@ -19,7 +19,7 @@ class CC_PAINT_EXPORT TransformDisplayItem : public DisplayItem {
   ~TransformDisplayItem() override;
 
   size_t ExternalMemoryUsage() const { return 0; }
-  int ApproximateOpCount() const { return 1; }
+  int OpCount() const { return 1; }
 
   const gfx::Transform transform;
 };
@@ -29,7 +29,7 @@ class CC_PAINT_EXPORT EndTransformDisplayItem : public DisplayItem {
   EndTransformDisplayItem();
   ~EndTransformDisplayItem() override;
 
-  int ApproximateOpCount() const { return 0; }
+  int OpCount() const { return 0; }
 };
 
 }  // namespace cc