Adding sync integration tests to official build artifacts

Following the steps done in https://codereview.chromium.org/323163003/

Not sure how to test this, any guidance?

I want the sync_integration_tests binary to be stored in
official Chrome build gs:// drops just like
browser_tests and other test binaries already are. Then
I can set up automation to approve new releases of Sync
server.

BUG=411389

Review URL: https://codereview.chromium.org/545103003

Cr-Commit-Position: refs/heads/master@{#293775}

build/all.gyp

@@ -1126,6 +1126,7 @@
               'dependencies': [
                 '../base/base.gyp:base_unittests',
                 '../chrome/chrome.gyp:browser_tests',
+		'../chrome/chrome.gyp:sync_integration_tests', 
                 '../chrome/chrome.gyp:crash_service',
                 '../chrome/chrome.gyp:gcapi_dll',
                 '../chrome/chrome.gyp:pack_policy_templates',

chrome/tools/build/linux/TESTS

 interactive_ui_tests
 browser_tests
+sync_integration_tests

chrome/tools/build/win/FILES.cfg

@@ -35,6 +35,11 @@ FILES = [
     'buildtype': ['official'],
     'archive':  'browser_tests.exe',
   },
+  {
+    'filename': 'sync_integration_tests.exe',
+    'buildtype': ['official'],
+    'archive':  'sync_integration_tests.exe',
+  },
   {
     'filename': 'ffmpegsumo.dll',
     'buildtype': ['dev', 'official'],