Track SimpleCache memory usage in net/ MemoryDumpProvider

net/disk_cache/simple/simple_index.h

Index: net/disk_cache/simple/simple_index.h
diff --git a/net/disk_cache/simple/simple_index.h b/net/disk_cache/simple/simple_index.h
index 1adb0ecc48a3f4e177fc392eb0b1726a5e1d9d1c..7758d91362ab14882989e9ee19e05628fe108d53 100644
--- a/net/disk_cache/simple/simple_index.h
+++ b/net/disk_cache/simple/simple_index.h
@@ -166,6 +166,9 @@ class NET_EXPORT_PRIVATE SimpleIndex
 
   IndexInitMethod init_method() const { return init_method_; }
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   friend class SimpleIndexTest;
   FRIEND_TEST_ALL_PREFIXES(SimpleIndexTest, IndexSizeCorrectOnMerge);