Fall back to shortcut A2HS when Phonesky is out of date or unavailable.

chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java
index 5bcfc29be1eda30ca1c86f1e8a9deb4b03adda78..50624d363e2f039a148d32936b945ce1da5ce449 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java
@@ -32,6 +32,40 @@ public interface GooglePlayWebApkInstallDelegate {
     public static final int INSTALLED = 6;
 
     /**
+     * Status code indicating that the installation request has been successfully processed and
+     * installation has been scheduled.
+     */
+    public static final int STATUS_CODE_SUCCESS = 0;
+
+    /**
+     * Status code indicating that the installation request has been rejected due to caller
+     * verification failure.
+     */
+    public static final int STATUS_CODE_CALLER_VERIFICATION_FAILURE = -1;
+
+    /**
+     * Status code indicating that the installation request has been rejected because the caller is
+     * not allowed to install a given package.
+     */
+    public static final int STATUS_CODE_POLICY_VIOLATION = -2;
+
+    /**
+     * Status code indicating that the install api is currently disabled.
+     */
+    public static final int STATUS_CODE_API_DISABLED = -3;
+    /**
+     * Status code indicating that the install request has failed. error Bundle field in the
+     * response bundle will contain failure reason.
+     */
+    public static final int STATUS_CODE_REQUEST_FAILED = -4;
+
+    /**
+     * Status code indicating that it fails to bind to the  Google Play Service.
+     */
+    public static final int STATUS_CODE_FAIL_TO_BIND_TO_SERVICE = -5;
+
+    public static final int STATUS_CODE_OTHERS = -6;
+    /**
      * Uses Google Play to install WebAPK asynchronously.
      * @param packageName The package name of WebAPK to install.
      * @param version The version of WebAPK to install.
@@ -51,4 +85,24 @@ public interface GooglePlayWebApkInstallDelegate {
      * @param event The result of the install.
      */
     void onGotInstallEvent(String packageName, @InstallerPackageEvent int event);
+
+    /**
+     * Checks whether Google Play Install API is available.
+     * @param packageName The package name of WebAPK to install.
+     * @param version The version of WebAPK to install.
+     * @param title The title of the WebAPK to display during installation.
+     * @param token The token from WebAPK Minter Server.
+     * @param url The start URL of the WebAPK to install.
+     * @param callback The callback to invoke when the check is done.
+     * @return True if the Install API is available.
+     */
+    boolean canUseInstallApi(String packageName, int version, String title, String token,
+            String url, Callback<Boolean> callback);
+
+    /**
+     * Calls the callback once the check of whether Google Play Install API is available is done.
+     * @param packageName The package name of the WebAPK for the check.
+     * @param statusCode The error code returned by Google Play.
+     */
+    void onCanUseInstallApi(String packageName, int statusCode);
 }