add missing webxdc api

src/main/java/org/thoughtcrime/securesms/WebxdcActivity.java

@@ -74,7 +74,9 @@ public class WebxdcActivity extends WebViewActivity implements DcEventCenter.DcE
   private DcMsg dcAppMsg;
   private String baseURL;
   private String sourceCodeUrl = "";
-  private String selfAddr = "";
+  private String selfAddr;
+  private int sendUpdateMaxSize;
+  private int sendUpdateInterval;
   private boolean internetAccess = false;
   private boolean hideActionBar = false;
 
@@ -199,7 +201,9 @@ public class WebxdcActivity extends WebViewActivity implements DcEventCenter.DcE
 
     final JSONObject info = this.dcAppMsg.getWebxdcInfo();
     internetAccess = JsonUtils.optBoolean(info, "internet_access");
-    selfAddr = JsonUtils.optString(info, "self_addr");
+    selfAddr = info.optString("self_addr");
+    sendUpdateMaxSize = info.optInt("send_update_max_size");
+    sendUpdateInterval = info.optInt("send_update_interval");
 
     toggleFakeProxy(!internetAccess);
 
@@ -494,6 +498,16 @@ public class WebxdcActivity extends WebViewActivity implements DcEventCenter.DcE
   }
 
   class InternalJSApi {
+    @JavascriptInterface
+    public int sendUpdateMaxSize() {
+      return WebxdcActivity.this.sendUpdateMaxSize;
+    }
+
+    @JavascriptInterface
+    public int sendUpdateInterval() {
+      return WebxdcActivity.this.sendUpdateInterval;
+    }
+
     @JavascriptInterface
     public String selfAddr() {
       return WebxdcActivity.this.selfAddr;