Add a new api "isDefaultBrowser" for new Intent Picker

Bug: 177923646
Bug: 182530528
Test: manual test
Change-Id: If1687c00b1420b424e68577e0c5b8714b95fe400

packages/SettingsLib/src/com/android/settingslib/applications/AppUtils.java

@@ -31,6 +31,7 @@ import android.os.Environment;
 import android.os.RemoteException;
 import android.os.SystemProperties;
 import android.os.UserHandle;
+import android.text.TextUtils;
 import android.util.Log;
 
 import com.android.settingslib.R;
@@ -198,4 +199,17 @@ public class AppUtils {
         }
         return false;
     }
+
+    /**
+     * Returns a boolean indicating whether a given package is a default browser.
+     *
+     * @param packageName a given package.
+     * @return true if the given package is default browser.
+     */
+    public static boolean isDefaultBrowser(Context context, String packageName) {
+        final String defaultBrowserPackage =
+                context.getPackageManager().getDefaultBrowserPackageNameAsUser(
+                        UserHandle.myUserId());
+        return TextUtils.equals(packageName, defaultBrowserPackage);
+    }
 }