Add support for webapk without runtimeHost

chrome/android/webapk/libs/common/src/org/chromium/webapk/lib/common/WebApkConstants.java

Index: chrome/android/webapk/libs/common/src/org/chromium/webapk/lib/common/WebApkConstants.java
diff --git a/chrome/android/webapk/libs/common/src/org/chromium/webapk/lib/common/WebApkConstants.java b/chrome/android/webapk/libs/common/src/org/chromium/webapk/lib/common/WebApkConstants.java
index 7aaa4604be72c92415bd33cd51ac8e588d65db19..45b6a2c34c6c501c79f92a5be93ad2248dedd264 100644
--- a/chrome/android/webapk/libs/common/src/org/chromium/webapk/lib/common/WebApkConstants.java
+++ b/chrome/android/webapk/libs/common/src/org/chromium/webapk/lib/common/WebApkConstants.java
@@ -24,7 +24,12 @@ public final class WebApkConstants {
     public static final String EXTRA_WEBAPK_FORCE_NAVIGATION =
             "org.chromium.chrome.browser.webapk_force_navigation";
 
+    public static final String DEFAULT_HOST_BROWSER = "com.android.chrome";
+
     // Must be kept in sync with chrome/browser/android/shortcut_info.h.
     public static final int SHORTCUT_SOURCE_UNKNOWN = 0;
     public static final int SHORTCUT_SOURCE_EXTERNAL_INTENT = 9;
+
+    /** Name of the shared preferences file. */
+    public static final String PREF_PACKAGE = "org.chromium.webapk.shell_apk";
 }