[Android O] Initialize channels on first launch/upgrade

chrome/android/junit/src/org/chromium/chrome/browser/notifications/ChannelsInitializerTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/notifications/ChannelsInitializerTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/notifications/ChannelsInitializerTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/notifications/ChannelsInitializerTest.java
index 1ecb37cf30c7dc2826cae037ac36411f87973d4a..7a161b01f613d9071141bff96ccffe46bd6dec17 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/notifications/ChannelsInitializerTest.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/notifications/ChannelsInitializerTest.java
@@ -4,6 +4,7 @@
 
 package org.chromium.chrome.browser.notifications;
 
+import static org.hamcrest.Matchers.greaterThan;
 import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.assertThat;
 
@@ -31,6 +32,12 @@ public class ChannelsInitializerTest {
     }
 
     @Test
+    public void testInitializeStartupChannels() throws Exception {
+        mChannelsInitializer.initializeStartupChannels();
+        assertThat(mMockNotificationManager.getChannels().size(), is(greaterThan(0)));
+    }
+
+    @Test
     public void testEnsureInitialized_browserChannel() throws Exception {
         mChannelsInitializer.ensureInitialized(ChannelsInitializer.CHANNEL_ID_BROWSER);