enterprise.platformKeys: Copy-on-read the 'algorithm' member of Key objects.

extensions/renderer/utils_native_handler.h

Index: extensions/renderer/utils_native_handler.h
diff --git a/extensions/renderer/utils_native_handler.h b/extensions/renderer/utils_native_handler.h
index 6fbc62d0f163a2af7dedb5f26beea5bfe6bb63c8..1b2c8bb77c8f7f3895ff221f8f4f2bffeab6385d 100644
--- a/extensions/renderer/utils_native_handler.h
+++ b/extensions/renderer/utils_native_handler.h
@@ -21,6 +21,11 @@ class UtilsNativeHandler : public ObjectBackedNativeHandler {
   // that wraps the implementation, while hiding its members.
   void CreateClassWrapper(const v8::FunctionCallbackInfo<v8::Value>& args);
 
+  // |args| consists of one argument: an arbitrary value. Returns a deep copy of
+  // that value. The copy will have no references to nested values of the
+  // argument.
+  void DeepCopy(const v8::FunctionCallbackInfo<v8::Value>& args);
+
   DISALLOW_COPY_AND_ASSIGN(UtilsNativeHandler);
 };