Add //testing/perf and fix up output file location in yasm_assemble.gni.

third_party/yasm/yasm_assemble.gni

Index: third_party/yasm/yasm_assemble.gni
diff --git a/third_party/yasm/yasm_assemble.gni b/third_party/yasm/yasm_assemble.gni
index 9044efabba24367eddba66bbec57345816b600c4..ce0ef275c86fb1c2a80af6d6ccbfe1e0912997f2 100644
--- a/third_party/yasm/yasm_assemble.gni
+++ b/third_party/yasm/yasm_assemble.gni
@@ -161,7 +161,7 @@ template("yasm_assemble") {
     # exactly duplicate the naming and location of object files from the
     # native build, which would be:
     # "$root_out_dir/${target_name}.{{source_dir_part}}.$asm_obj_extension"
-    outputs = [ "$target_out_dir/{{source_name_part}}.o" ]
+    outputs = [ "$target_gen_dir/{{source_name_part}}.o" ]

[brettw, 2014/07/08 21:11:48]

Why change this? The out dir is where the normal .o files go, so it seems like
yasm should put them there as well.

     args += [
       "-o", rebase_path(outputs[0], root_build_dir),
       "{{source}}"