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

cc/paint/display_item_list.h

Index: cc/paint/display_item_list.h
diff --git a/cc/paint/display_item_list.h b/cc/paint/display_item_list.h
index d838a53253c022101edfb3e6fcf0a0c7b0fbe123..3a5b3f8e2bf494bc8c696832f9fa0f8d0a079545 100644
--- a/cc/paint/display_item_list.h
+++ b/cc/paint/display_item_list.h
@@ -130,7 +130,7 @@ class CC_PAINT_EXPORT DisplayItemList
   }
   bool IsSuitableForGpuRasterization() const;
 
-  int ApproximateOpCount() const;
+  size_t OpCount() const;
   size_t ApproximateMemoryUsage() const;
   bool ShouldBeAnalyzedForSolidColor() const;
 
@@ -183,7 +183,7 @@ class CC_PAINT_EXPORT DisplayItemList
   const DisplayItemType& AllocateAndConstruct(Args&&... args) {
     auto* item = &items_.AllocateAndConstruct<DisplayItemType>(
         std::forward<Args>(args)...);
-    approximate_op_count_ += item->ApproximateOpCount();
+    op_count_ += item->OpCount();
     return *item;
   }
 
@@ -199,7 +199,7 @@ class CC_PAINT_EXPORT DisplayItemList
   std::vector<gfx::Rect> visual_rects_;
   std::vector<size_t> begin_item_indices_;
 
-  int approximate_op_count_ = 0;
+  size_t op_count_ = 0u;
   bool all_items_are_suitable_for_gpu_rasterization_ = true;
   // For testing purposes only. Whether to keep visual rects across calls to
   // Finalize().