Put the syzygy targets behind a 'syzygy_optimize' flag.

chrome/chrome_syzygy.gypi

Index: chrome/chrome_syzygy.gypi
diff --git a/chrome/chrome_syzygy.gypi b/chrome/chrome_syzygy.gypi
index a5273ba446dbfc28eb9141938bab2856aa8ed530..e18cdecc6863416f794f4765d2049f48123a8770 100644
--- a/chrome/chrome_syzygy.gypi
+++ b/chrome/chrome_syzygy.gypi
@@ -17,7 +17,7 @@
     'dest_dir': '<(PRODUCT_DIR)/syzygy',
   },
   'conditions': [
-    ['syzyasan!=1', {
+    ['syzyasan!=1 and syzygy_optimize==1', {

[scottmg, 2014/03/18 17:21:13]

nit; can you use either !=1 or ==0 consistently for this and the one below?
(don't care which)

[Sébastien Marchand, 2014/03/18 18:25:00]

Done.

       # Reorder chrome DLL executable.
       # If there's a matching chrome.dll-ordering.json file present in
       # the output directory, chrome.dll will be ordered according to
@@ -42,7 +42,8 @@
           ],
         },
       ],
-    }, {
+    }],
+    ['syzyasan==1 and syzygy_optimize==0', {
       # Instrument chrome DLL executable with SyzyAsan.
       'actions': [
         {