[Android O] Initialize channels on first launch/upgrade

chrome/test/android/javatests/src/org/chromium/chrome/test/util/browser/notifications/MockNotificationManagerProxy.java

Index: chrome/test/android/javatests/src/org/chromium/chrome/test/util/browser/notifications/MockNotificationManagerProxy.java
diff --git a/chrome/test/android/javatests/src/org/chromium/chrome/test/util/browser/notifications/MockNotificationManagerProxy.java b/chrome/test/android/javatests/src/org/chromium/chrome/test/util/browser/notifications/MockNotificationManagerProxy.java
index 44a86857cdefb68867b196b0ee9d85c084554e3c..0e50e6902e035d066e6e29a1220cca3f117e08d2 100644
--- a/chrome/test/android/javatests/src/org/chromium/chrome/test/util/browser/notifications/MockNotificationManagerProxy.java
+++ b/chrome/test/android/javatests/src/org/chromium/chrome/test/util/browser/notifications/MockNotificationManagerProxy.java
@@ -10,6 +10,7 @@ import org.chromium.chrome.browser.notifications.ChannelsInitializer;
 import org.chromium.chrome.browser.notifications.NotificationManagerProxy;
 
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -114,6 +115,23 @@ public class MockNotificationManagerProxy implements NotificationManagerProxy {
     }
 
     @Override
+    public List<String> getNotificationChannelIds() {
+        List<String> channelIds = new ArrayList<>();
+        for (ChannelsInitializer.Channel channel : mChannels) {
+            channelIds.add(channel.mId);
+        }
+        return channelIds;
+    }
+
+    @Override
+    public void deleteNotificationChannel(@ChannelsInitializer.ChannelId String id) {
+        for (Iterator<ChannelsInitializer.Channel> it = mChannels.iterator(); it.hasNext();) {
+            ChannelsInitializer.Channel channel = it.next();
+            if (id.equals(channel.mId)) it.remove();
+        }
+    }
+
+    @Override
     public void notify(int id, Notification notification) {
         notify(null /* tag */, id, notification);
     }