[zx api] Add read_memory and write_memory to zx:: wrappers.

Adds pass-throughs for zx_process_read_memory and
zx_process_write_memory to the zx::process object.

Change-Id: Ia88bf31c29dafbd162d9ada5eb002dc398b34f49
diff --git a/system/ulib/zx/include/zx/process.h b/system/ulib/zx/include/zx/process.h
index 38ec5ce..d8bf118 100644
--- a/system/ulib/zx/include/zx/process.h
+++ b/system/ulib/zx/include/zx/process.h
@@ -41,6 +41,14 @@
     zx_status_t start(const thread& thread_handle, uintptr_t entry,
                       uintptr_t stack, handle arg_handle, uintptr_t arg2) const;
 
+    zx_status_t read_memory(uintptr_t vaddr, void* buffer, size_t len, size_t* actual) const {
+        return zx_process_read_memory(get(), vaddr, buffer, len, actual);
+    }
+
+    zx_status_t write_memory(uintptr_t vaddr, const void* buffer, size_t len, size_t* actual) {
+        return zx_process_write_memory(get(), vaddr, buffer, len, actual);
+    }
+
     static inline const unowned<process> self() {
         return unowned<process>(zx_process_self());
     }