[Android] Disable "Add to Home Screen" for chrome://credits page

chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabAppMenuPropertiesDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabAppMenuPropertiesDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabAppMenuPropertiesDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabAppMenuPropertiesDelegate.java
index e264a259b7b17f605a34856c9d9ccd6b0c67a776..1217ba1177147caca3844c06e0dc6f56108c079c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabAppMenuPropertiesDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabAppMenuPropertiesDelegate.java
@@ -16,6 +16,7 @@ import org.chromium.base.BuildInfo;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
+import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.appmenu.AppMenuPropertiesDelegate;
 import org.chromium.chrome.browser.download.DownloadUtils;
 import org.chromium.chrome.browser.firstrun.FirstRunStatus;
@@ -133,6 +134,13 @@ public class CustomTabAppMenuPropertiesDelegate extends AppMenuPropertiesDelegat
 
             downloadItem.setEnabled(DownloadUtils.isAllowedToDownloadPage(currentTab));
 
+            String url = currentTab.getUrl();
+            boolean isChromeScheme = url.startsWith(UrlConstants.CHROME_SCHEME)
+                    || url.startsWith(UrlConstants.CHROME_NATIVE_SCHEME);
+            if (isChromeScheme) {
+                addToHomeScreenItem.setVisible(false);
+            }
+
             // Add custom menu items. Make sure they are only added once.
             if (!mIsCustomEntryAdded) {
                 mIsCustomEntryAdded = true;