Implement InstanceID API functions.

chrome/test/data/extensions/api_test/instance_id/get_creation_time/get_creation_time.js

Index: chrome/test/data/extensions/api_test/instance_id/get_creation_time/get_creation_time.js
diff --git a/chrome/test/data/extensions/api_test/instance_id/get_creation_time/get_creation_time.js b/chrome/test/data/extensions/api_test/instance_id/get_creation_time/get_creation_time.js
new file mode 100644
index 0000000000000000000000000000000000000000..4e29a4129b60bb3153fafd31384f9b8dfda3aa46
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/instance_id/get_creation_time/get_creation_time.js
@@ -0,0 +1,57 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function getCreationTimeWithoutCallback() {
+  try {
+    chrome.instanceID.getCreationTime();
+    chrome.test.fail(
+        "Calling getCreationTime without callback should fail.");
+  } catch (e) {
+    chrome.test.succeed();
+  };
+}
+
+function getCreationTimeBeforeGetID() {
+  chrome.instanceID.getCreationTime(function(creationTime) {
+    if (chrome.runtime.lastError) {
+      chrome.test.fail(
+          "chrome.runtime.lastError: " + chrome.runtime.lastError.message);
+      return;
+    }
+    if (creationTime) {
+      chrome.test.fail("Creation time should be zero.");
+      return;
+    }
+
+    chrome.test.succeed();
+  });
+}
+
+function getCreationTimeAfterGetID() {
+  chrome.instanceID.getID(function(id) {
+    if (!id) {
+      chrome.test.fail("ID should not be zero.");
+      return;
+    }
+    chrome.instanceID.getCreationTime(function(creationTime) {
+      if (chrome.runtime.lastError) {
+        chrome.test.fail(
+            "chrome.runtime.lastError: " + chrome.runtime.lastError.message);
+        return;
+      }
+      if (!creationTime) {
+        chrome.test.fail("Creation time should not be zero.");
+        return;
+      }
+
+      chrome.test.succeed();
+    });
+  });
+}
+
+chrome.test.runTests([
+  getCreationTimeWithoutCallback,
+  getCreationTimeBeforeGetID,
+  getCreationTimeAfterGetID,

[fgorski, 2015/05/07 19:59:53]

how about a test for getting creation time after ID was deleted?

[jianli, 2015/05/07 20:47:01]

ditto.

+]);