Limit pinned home tile IPH to users with a customized homepage

BUG=889285

Change-Id: If0210b1b934a2651e664af3d18268f453872d591
Reviewed-on: https://chromium-review.googlesource.com/1246143Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594374}

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageLayout.java

@@ -37,6 +37,7 @@ import org.chromium.chrome.browser.native_page.ContextMenuManager;
 import org.chromium.chrome.browser.ntp.NewTabPage.OnSearchBoxScrollListener;
 import org.chromium.chrome.browser.ntp.NewTabPageView.NewTabPageManager;
 import org.chromium.chrome.browser.offlinepages.OfflinePageBridge;
+import org.chromium.chrome.browser.partnercustomizations.HomepageManager;
 import org.chromium.chrome.browser.profiles.Profile;
 import org.chromium.chrome.browser.suggestions.SiteSection;
 import org.chromium.chrome.browser.suggestions.SiteSectionViewHolder;
@@ -289,6 +290,9 @@ public class NewTabPageLayout extends LinearLayout implements TileGroup.Observer
         SiteSuggestion data = getTileGroup().getHomepageTileData();
         if (data == null) return;
 
+        // Only show the IPH bubble for users with a customized homepage.
+        if (HomepageManager.getInstance().getPrefHomepageUseDefaultUri()) return;
+
         final Tracker tracker = TrackerFactory.getTrackerForProfile(Profile.getLastUsedProfile());
         if (!tracker.shouldTriggerHelpUI(FeatureConstants.HOMEPAGE_TILE_FEATURE)) return;