[Android] Adding content settings provider for notification channels

chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationSettingsBridge.java

+// Copyright 2017 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.
+
+package org.chromium.chrome.browser.notifications;
+
+import org.chromium.base.BuildInfo;
+import org.chromium.base.annotations.CalledByNative;
+
+/**
+ * Interface for native code to interact with Android notification channels.
+ */
+public class NotificationSettingsBridge {
+    // TODO(awdf): Remove this and check BuildInfo.sdk_int() from native instead, once SdkVersion
+    // enum includes Android O.
+    @CalledByNative
+    static boolean shouldUseChannelSettings() {
+        return BuildInfo.isAtLeastO();
+    }
+
+    /**
+     * Creates a notification channel for the given origin.
+     * @param origin The site origin to be used as the channel name.
+     * @param enabled True if the channel should be initially enabled, false if
+     *                it should start off as blocked.
+     * @return true if the channel was successfully created, false otherwise.
+     */
+    @CalledByNative
+    static boolean createChannel(String origin, boolean enabled) {
+        // TODO(crbug.com/700377) Actually construct a channel.
+        return false;
+    }
+
+    @CalledByNative
+    static @NotificationChannelStatus int getChannelStatus(String origin) {
+        // TODO(crbug.com/700377) Actually check channel status.
+        return NotificationChannelStatus.UNAVAILABLE;
+    }
+
+    @CalledByNative
+    static void deleteChannel(String origin) {
+        // TODO(crbug.com/700377) Actually delete channel.
+    }
+}