Privacy Sandbox Android: updated the help page URL to be retrieved fr…

…om the feature param

Merge approved in crbug.com/1184701

(cherry picked from commit 3e5568b)

Bug: 1152351, 1184701
Change-Id: I8826b08737930a750bce59451d9ce4aeeb3a744b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2735816
Commit-Queue: Andrey Zaytsev <andzaytsev@google.com>
Commit-Queue: Martin Šrámek <msramek@chromium.org>
Auto-Submit: Andrey Zaytsev <andzaytsev@google.com>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#859797}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2740917
Cr-Commit-Position: refs/branch-heads/4430@{#221}
Cr-Branched-From: e5ce7dc-refs/heads/master@{#857950}

chrome/browser/privacy_sandbox/android/BUILD.gn

@@ -20,6 +20,7 @@ android_library("java") {
     ":java_resources",
     "//base:base_java",
     "//base:jni_java",
+    "//chrome/browser/flags:java",
     "//chrome/browser/settings:java",
     "//chrome/browser/ui/messages/android:java",
     "//components/browser_ui/settings/android:java",

chrome/browser/privacy_sandbox/android/java/src/org/chromium/chrome/browser/privacy_sandbox/PrivacySandboxSettingsFragment.java

@@ -21,6 +21,7 @@
 import org.chromium.base.IntentUtils;
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.base.metrics.RecordUserAction;
+import org.chromium.chrome.browser.flags.ChromeFeatureList;
 import org.chromium.chrome.browser.settings.ChromeManagedPreferenceDelegate;
 import org.chromium.components.browser_ui.settings.ChromeSwitchPreference;
 import org.chromium.components.browser_ui.settings.SettingsUtils;
@@ -34,8 +35,9 @@
  */
 public class PrivacySandboxSettingsFragment
         extends PreferenceFragmentCompat implements Preference.OnPreferenceChangeListener {
-    public static final String PRIVACY_SANDBOX_URL =
-            "https://www.google.com/chrome/privacy-sandbox";
+    public static final String PRIVACY_SANDBOX_DEFAULT_URL =
+            "https://web.dev/digging-into-the-privacy-sandbox/";
+    public static final String EXPERIMENT_URL_PARAM = "website-url";
     // Key for the argument with which the PrivacySandbox fragment will be launched. The value for
     // this argument should be part of the PrivacySandboxReferrer enum, which contains all points of
     // entry to the Privacy Sandbox UI.
@@ -69,7 +71,7 @@ public void onCreatePreferences(Bundle bundle, String s) {
                         getContext().getString(R.string.privacy_sandbox_description),
                         new SpanInfo("<link>", "</link>",
                                 new NoUnderlineClickableSpan(getContext().getResources(),
-                                        (widget) -> openUrlInCct(PRIVACY_SANDBOX_URL)))));
+                                        (widget) -> openUrlInCct(getPrivacySandboxUrl())))));
         // Format the toggle description, which has bullet points.
         findPreference(TOGGLE_DESCRIPTION_PREFERENCE)
                 .setSummary(SpanApplier.applySpans(
@@ -120,7 +122,7 @@ public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
     public boolean onOptionsItemSelected(MenuItem item) {
         if (item.getItemId() == R.id.menu_id_targeted_help) {
             // Action for the question mark button.
-            openUrlInCct(PRIVACY_SANDBOX_URL);
+            openUrlInCct(getPrivacySandboxUrl());
             return true;
         }
         return false;
@@ -143,6 +145,14 @@ private ChromeManagedPreferenceDelegate createManagedPreferenceDelegate() {
         };
     }
 
+    private String getPrivacySandboxUrl() {
+        // Get the URL from Finch, if defined.
+        String url = ChromeFeatureList.getFieldTrialParamByFeature(
+                ChromeFeatureList.PRIVACY_SANDBOX_SETTINGS, EXPERIMENT_URL_PARAM);
+        if (url == null || url.isEmpty()) return PRIVACY_SANDBOX_DEFAULT_URL;
+        return url;
+    }
+
     private void openUrlInCct(String url) {
         assert (mCustomTabHelper != null)
                 && (mTrustedIntentHelper != null)