Adding sync_integration_tests to the chromeos_builder target.

This will cause the sync_integration_tests to be built on the trybots,
however, they won't be run unless bot changes are made.

BUG=None
TEST=None
Review URL: http://codereview.chromium.org/6724005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@79053 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -475,6 +475,7 @@
             '../chrome/chrome.gyp:safe_browsing_tests',
             '../chrome/chrome.gyp:startup_tests',
             '../chrome/chrome.gyp:sync_unit_tests',
+            '../chrome/chrome.gyp:sync_integration_tests',
             '../chrome/chrome.gyp:tab_switching_test',
             '../chrome/chrome.gyp:ui_tests',
             '../chrome/chrome.gyp:unit_tests',