Add MinidumpMemoryListWriter::AddFromSnapshot(), everything downstream and its test

minidump/minidump_module_writer.h

Index: minidump/minidump_module_writer.h
diff --git a/minidump/minidump_module_writer.h b/minidump/minidump_module_writer.h
index 6dc0319dc3b21e74acf44c3a81dc61bec72551d6..9fb10c2c31a7f7c0a726a8b9dcfe2f7ce558cc11 100644
--- a/minidump/minidump_module_writer.h
+++ b/minidump/minidump_module_writer.h
@@ -320,9 +320,9 @@ class MinidumpModuleListWriter final : public internal::MinidumpStreamWriter {
   //!
   //! \param[in] module_snapshots The module snapshots to use as source data.
   //!
-  //! \note Valid in #kStateMutable. AddModule() may not be called before this
-  //!     this method, and it is not normally necessary to call AddModule()
-  //!     after this method.
+  //! \note Valid in #kStateMutable. No mutator methods may be called before
+  //!     this method, and it is not normally necessary to call any mutator
+  //!     methods after this method.
   void InitializeFromSnapshot(
       const std::vector<const ModuleSnapshot*>& module_snapshots);