import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

mobile/android/modules/Snackbars.jsm

@@ -0,0 +1,72 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
+
+this.EXPORTED_SYMBOLS = ["Snackbars"];
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Messaging", "resource://gre/modules/Messaging.jsm");
+
+const LENGTH_INDEFINITE = -2;
+const LENGTH_LONG = 0;
+const LENGTH_SHORT = -1;
+
+var Snackbars = {
+  LENGTH_INDEFINITE: LENGTH_INDEFINITE,
+  LENGTH_LONG: LENGTH_LONG,
+  LENGTH_SHORT: LENGTH_SHORT,
+
+  show: function(aMessage, aDuration, aOptions) {
+
+    // Takes care of the deprecated toast calls
+    if (typeof aDuration === "string") {
+      [aDuration, aOptions] = migrateToastIfNeeded(aDuration, aOptions);
+    }
+
+    let msg = {
+      type: 'Snackbar:Show',
+      message: aMessage,
+      duration: aDuration,
+    };
+
+    if (aOptions && aOptions.backgroundColor) {
+      msg.backgroundColor = aOptions.backgroundColor;
+    }
+
+    if (aOptions && aOptions.action) {
+      msg.action = {};
+
+      if (aOptions.action.label) {
+        msg.action.label = aOptions.action.label;
+      }
+
+      Messaging.sendRequestForResult(msg).then(result => aOptions.action.callback());
+    } else {
+      Messaging.sendRequest(msg);
+    }
+  }
+};
+
+function migrateToastIfNeeded(aDuration, aOptions) {
+  let duration;
+  if (aDuration === "long") {
+    duration = LENGTH_LONG;
+  }
+  else {
+    duration = LENGTH_SHORT;
+  }
+
+  let options = {};
+  if (aOptions && aOptions.button) {
+    options.action = {
+      label: aOptions.button.label,
+      callback: () => aOptions.button.callback(),
+    };
+  }
+  return [duration, options];
+}