[webnfc] Add public interfaces.

third_party/WebKit/public/platform/modules/nfc/WebNFCClient.h

+// Copyright 2015 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.
+
+#ifndef WebNFCClient_h
+#define WebNFCClient_h
+
+#include "public/platform/WebCallbacks.h"
+#include "public/platform/WebPassOwnPtr.h"
+
+namespace blink {
+
+enum class WebNFCError;
+struct WebNFCMessage;
+class WebNFCObserver;
+struct WebNFCPushOptions;
+enum class WebNFCPushTarget;
+struct WebNFCWatchOptions;
+
+// Success and failure callbacks for push, cancelPush, cancelWatch and cancelAllWatches methods.
+using WebNFCCallbacks = WebCallbacks<void, const WebNFCError&>;
+
+// Success and failure callbacks for watch method.
+using WebNFCWatchOptionsCallbacks = WebCallbacks<long, const WebNFCError&>;
+
+class WebNFCClient {
+public:
+    virtual ~WebNFCClient() { }
+
+    // Sets observer to the client so it can notify the observer about
+    // triggered NFC watch events.
+    virtual void setObserver(WebNFCObserver*) = 0;
+
+    // NFC interface methods:
+
+    // See https://w3c.github.io/web-nfc/#the-push-method
+    // WebNFCCallbacks ownership is transfered to the client.
+    virtual void push(const WebNFCMessage&, const WebNFCPushOptions&, WebNFCCallbacks*) = 0;
+
+    // See https://w3c.github.io/web-nfc/#cancelPush
+    // WebNFCCallbacks ownership is transfered to the client.
+    virtual void cancelPush(const WebNFCPushTarget&, WebNFCCallbacks*) = 0;
+
+    // See https://w3c.github.io/web-nfc/#the-watch-method
+    // WebNFCWatchOptionsCallbacks ownership is transfered to the client.
+    virtual void watch(const WebNFCWatchOptions&, WebNFCWatchOptionsCallbacks*) = 0;
+
+    // See https://w3c.github.io/web-nfc/#the-cancelwatch-method
+    // WebNFCCallbacks ownership is transfered to the client.
+    virtual void cancelWatch(long id, WebNFCCallbacks*) = 0;
+    virtual void cancelAllWatches(WebNFCCallbacks*) = 0;
+
+    // Methods that are required to implement suspended state.
+    // See https://w3c.github.io/web-nfc/#nfc-suspended
+    virtual void suspendNFCOperations() = 0;
+    virtual void resumeNFCOperations() = 0;
+};
+
+} // namespace blink
+
+#endif // WebNFCClient_h