Add desktop engagement metrics.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index d90622dee8807887f26a30bef00f2a595387c516..ba95f45d112cead290cd11c3282e1795ba882b1f 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -234,7 +234,7 @@
       'browser/extensions/background_xhr_browsertest.cc',
       'browser/extensions/browsertest_util_browsertest.cc',
       'browser/extensions/chrome_app_api_browsertest.cc',
-      'browser/extensions/chrome_ui_overrides_browsertest.cc',      
+      'browser/extensions/chrome_ui_overrides_browsertest.cc',
       'browser/extensions/content_capabilities_browsertest.cc',
       'browser/extensions/content_script_apitest.cc',
       'browser/extensions/content_security_policy_apitest.cc',
@@ -886,6 +886,11 @@
       'browser/ui/webui/options/chromeos/guest_mode_options_ui_browsertest.cc',
       'browser/ui/webui/options/chromeos/shared_options_browsertest.cc',
     ],
+    'chrome_browser_tests_non_mobile_non_cros_sources': [
+      # Tests for non mobile and non CrOS (includes Linux, Win, Mac).
+      'browser/metrics/desktop_engagement/audible_contents_tracker_browsertest.cc',
+      'browser/metrics/desktop_engagement/chrome_visibility_observer_browsertest.cc',
+    ],
     'chrome_browser_tests_views_non_cros_sources': [
       # This should be brought up on OSX Views but not CrOS.
       'browser/ui/views/profiles/profile_chooser_view_browsertest.cc',
@@ -2641,6 +2646,8 @@
           'sources!': [
             'browser/profiles/profile_statistics_browsertest.cc',
           ],
+        }, { # else 'OS=="android" or OS=="ios" or chromeos == 1'
+            'sources': [ '<@(chrome_browser_tests_non_mobile_non_cros_sources)' ],
         }],
         ['toolkit_views==1', {
           'sources': [ '<@(chrome_browser_tests_views_sources)' ],