Add the basic code skeleton for system info event router

chrome/test/data/extensions/api_test/systeminfo/storage/test_storage_api.js

Index: chrome/test/data/extensions/api_test/systeminfo/storage/test_storage_api.js
diff --git a/chrome/test/data/extensions/api_test/systeminfo/storage/test_storage_api.js b/chrome/test/data/extensions/api_test/systeminfo/storage/test_storage_api.js
index 5b4f834b3db7ee5b4d9d5f568409e52efadd7df0..27809b142628f7dbece17758699cbceff00a3b3d 100644
--- a/chrome/test/data/extensions/api_test/systeminfo/storage/test_storage_api.js
+++ b/chrome/test/data/extensions/api_test/systeminfo/storage/test_storage_api.js
@@ -7,10 +7,47 @@
 chrome.systemInfo = chrome.experimental.systemInfo;
 
 chrome.test.runTests([
-  function testGet() {
+  function testStorageGet() {
     chrome.systemInfo.storage.get(chrome.test.callbackPass(function(info) {
       // TODO(hmin): Need to check the value from Mock implementation
       chrome.test.assertTrue(info.units.length > 0);
     }));
+  },
+  function testChangedEvent() {
+    var numOfChangedEvent = 0;
+    var base = 10000;
+    var step = 10;
+    var doneChangedEvent = chrome.test.listenForever(
+      chrome.systemInfo.storage.onAvailableCapacityChanged,
+      function listener(changedInfo) {
+        chrome.test.assertTrue(changedInfo.id == "/dev/sda1");
+        chrome.test.assertTrue(
+          changedInfo.availableCapacity == (base - numOfChangedEvent*step));
+        if (++ numOfChangedEvent > 5)
+          doneChangedEvent();
+      });
+  },
+  function testAddedEvent() {
+    var numOfAddedEvent = 0;
+    var doneAddedEvent = chrome.test.listenForever(
+      chrome.systemInfo.storage.onAdded,
+      function listener(info) {
+        chrome.test.assertTrue(info.id == "/dev/sda2");
+        chrome.test.assertTrue(info.capacity == 4096);
+        chrome.test.assertTrue(info.type == "removable");
+        chrome.test.assertTrue(info.availableCapacity == 2048);
+        if (++numOfAddedEvent > 5)
+          doneAddedEvent();
+      });
+  },
+  function testRemovedEvent() {
+    var numOfRemovedEvent = 0;
+    var doneRemovedEvent = chrome.test.listenForever(
+      chrome.systemInfo.storage.onRemoved,
+      function listener(id) {
+        chrome.test.assertTrue(id == "/dev/sda2");
+        if (++numOfRemovedEvent > 5)
+          doneRemovedEvent();
+      });
   }
 ]);