Use metadata when launching WebAPKs.

chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappRegistryTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappRegistryTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappRegistryTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappRegistryTest.java
index 66f47e34cc3d94f3072e321ba40e986cb35eb3e3..671dc1758b752f55fe940a5e6e87396b7288b230 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappRegistryTest.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappRegistryTest.java
@@ -351,6 +351,28 @@ public class WebappRegistryTest {
     }
 
     @Test
+    @Feature({"WebApk"})
+    public void testCleanupRemovesUninstalledWebApks() throws Exception {
+        // Put the current time such that the task runs.
+        long currentTime = INITIAL_TIME + WebappRegistry.FULL_CLEANUP_DURATION;
+
+        String webappId = "webapk:uninstalledWebApk";
+        addWebappsToRegistry(webappId);
+
+        // Because the time is just inside the window, there should be a cleanup of uninstalled
+        // WebAPKs and the last cleaned up time should be set to the current time.
+        WebappRegistry.unregisterOldWebapps(Robolectric.application, currentTime);
+        BackgroundShadowAsyncTask.runBackgroundTasks();
+
+        Set<String> actual = mSharedPreferences.getStringSet(
+                WebappRegistry.KEY_WEBAPP_SET, Collections.<String>emptySet());
+        assertTrue(actual.isEmpty());
+
+        long lastCleanup = mSharedPreferences.getLong(WebappRegistry.KEY_LAST_CLEANUP, -1);
+        assertEquals(currentTime, lastCleanup);
+    }
+
+    @Test
     @Feature({"Webapp"})
     public void testClearWebappHistoryRunsCallback() throws Exception {
         CallbackRunner callback = new CallbackRunner();