Plug malloc_size_of as a patched copy. Documentation is done by

`get_malloc_size_src.sh`.
Add missing impls.rs with ethereum types related implementation.

mem/Cargo.toml

@@ -8,8 +8,7 @@ license = "GPL-3.0"
 
 [dependencies]
 clear_on_drop = "0.2"
-#malloc_size_of = { path = "../../servo/components/malloc_size_of", default-features = false }
-malloc_size_of_derive = { path = "../../servo/components/malloc_size_of_derive" }
+malloc_size_of_derive = { path = "./malloc_size_of_derive" }
 dlmalloc = { version = "0.1", optional = true }
 wee_alloc = { version = "0.4", optional = true }
 jemallocator = { version = "0.1", optional = true }
@@ -29,3 +28,5 @@ weealloc-global = ["wee_alloc"]
 jemalloc-global = ["jemallocator"]
 # implement additional types
 ethereum-impls = ["ethereum-types", "elastic-array"]
+# Default malloc to conditional mettering
+conditional-mettering = []

mem/README.md

@@ -5,3 +5,10 @@ Collection of memory related utilities.
 ## Features
 
 - volatile-erase : Not set by default, `Memzero` erase memory with `write_volatile`.
+- conditional-metering : Try to avoid counting `Arc` twice. For test only.
+
+Others feature are here to define global allocator, see `src/alloc.rs`.
+
+## Dependency
+
+This crate groups common dependency, `clear_on_drop` is reexported, and a patched copy of unpublished `malloc_size_of` from servo project is used and partially reexported.

mem/get_malloc_size_src.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# script/process to update code from servo project (malloc_size_of)
+# untested, note that we do not use submodule due to size of git repo
+git clone https://github.com/servo/servo.git
+cd servo
+git checkout 5bdea7dc1c80790a852a3fb03edfb2b8fbd403dc
+git apply ../slim_malloc_size_of.patch
+#git merge master
+cp components/malloc_size_of/lib.rs ../src/malloc_size.rs
+cp -r components/malloc_size_of_derive ..
+cd ..
+rm -rf ./servo

mem/malloc_size_of_derive/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "malloc_size_of_derive"
+version = "0.0.1"
+authors = ["The Servo Project Developers"]
+license = "MIT/Apache-2.0"
+publish = false
+
+[lib]
+path = "lib.rs"
+proc-macro = true
+
+[dependencies]
+proc-macro2 = "0.4"
+syn = { version = "0.15", features = ["full"] }
+synstructure = "0.10"

mem/malloc_size_of_derive/LICENSE-APACHE

@@ -0,0 +1,201 @@
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mem/malloc_size_of_derive/LICENSE-MIT

@@ -0,0 +1,23 @@
+Permission is hereby granted, free of charge, to any
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