Add a script to produce a syzygy-instrumented image of Chrome.dll

I've also modified the chrome_syzygy.gyp file to automaticaly produce the SyzyAsan'd version of Chrome.dll if 'asan'=1 on Windows.

TBR=sky@chromium.org

BUG=

Review URL: https://chromiumcodereview.appspot.com/12095105

git-svn-id: http://src.chromium.org/svn/trunk/src/build@181401 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -177,7 +177,7 @@
       'target_name': 'All_syzygy',
       'type': 'none',
       'conditions': [
-        ['OS=="win" and fastbuild==0 and asan!=1', {
+        ['OS=="win" and fastbuild==0', {
             'dependencies': [
               '../chrome/installer/mini_installer_syzygy.gyp:*',
             ],