Allow the app banner installability check to run on page load.

chrome/browser/engagement/site_engagement_service.h

Index: chrome/browser/engagement/site_engagement_service.h
diff --git a/chrome/browser/engagement/site_engagement_service.h b/chrome/browser/engagement/site_engagement_service.h
index 7b9a5d936d14055a368380a74ae84d31b0631363..35c005d1af69eefa392635567bbcf358f053b12c 100644
--- a/chrome/browser/engagement/site_engagement_service.h
+++ b/chrome/browser/engagement/site_engagement_service.h
@@ -26,6 +26,11 @@ namespace base {
 class Clock;
 }
 
+namespace banners {
+FORWARD_DECLARE_TEST(AppBannerManagerBrowserTest,

[benwells, 2017/03/30 08:22:37]

Is this required becaues the test is in a namespace?

[dominickn, 2017/03/30 23:42:52]

Yes, unfortunately.

+                     CheckOnLoadWithoutSufficientEngagement);
+}
+
 namespace content {
 class WebContents;
 }
@@ -173,6 +178,8 @@ class SiteEngagementService : public KeyedService,
   FRIEND_TEST_ALL_PREFIXES(SiteEngagementServiceTest,
                            IncognitoEngagementService);
   FRIEND_TEST_ALL_PREFIXES(SiteEngagementServiceTest, GetScoreFromSettings);
+  FRIEND_TEST_ALL_PREFIXES(banners::AppBannerManagerBrowserTest,
+                           CheckOnLoadWithoutSufficientEngagement);
   FRIEND_TEST_ALL_PREFIXES(AppBannerSettingsHelperTest, SiteEngagementTrigger);
 
 #if defined(OS_ANDROID)