Add SmbShareFinder class stubs

Adds SmbShareFinder which is a high-level class responsible for finding
available shares in a network. Functions are all NOTREACHED and will be
implemented in a future CL.

Bug: 757625
Change-Id: I88ba748df0dafa0a0a2a46d3500b4e057d59163b
Reviewed-on: https://chromium-review.googlesource.com/1089850
Commit-Queue: Allen Vicencio <allenvic@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566974}

chrome/browser/chromeos/BUILD.gn

@@ -1620,6 +1620,8 @@ source_set("chromeos") {
     "smb_client/smb_service_factory.h",
     "smb_client/smb_service_helper.cc",
     "smb_client/smb_service_helper.h",
+    "smb_client/smb_share_finder.cc",
+    "smb_client/smb_share_finder.h",
     "smb_client/smb_task_queue.cc",
     "smb_client/smb_task_queue.h",
     "smb_client/smb_url.cc",

chrome/browser/chromeos/smb_client/smb_share_finder.cc

+// Copyright 2018 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.
+
+#include "chrome/browser/chromeos/smb_client/smb_share_finder.h"
+
+namespace chromeos {
+namespace smb_client {
+
+void SmbShareFinder::GatherSharesInNetwork(GatherSharesResponse callback) {
+  NOTREACHED();
+}
+
+void SmbShareFinder::RegisterHostLocator(std::unique_ptr<HostLocator> locator) {
+  NOTREACHED();
+}
+
+void SmbShareFinder::OnHostsFound(GatherSharesResponse callback,
+                                  bool success,
+                                  const HostMap& hosts) {
+  NOTREACHED();
+}
+
+void SmbShareFinder::OnSharesFound(
+    const std::string& host_name,
+    GatherSharesResponse callback,
+    smbprovider::ErrorType error,
+    const smbprovider::DirectoryEntryListProto& entries) {
+  NOTREACHED();
+}
+
+}  // namespace smb_client
+}  // namespace chromeos

chrome/browser/chromeos/smb_client/smb_share_finder.h

+// Copyright 2018 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 CHROME_BROWSER_CHROMEOS_SMB_CLIENT_SMB_SHARE_FINDER_H_
+#define CHROME_BROWSER_CHROMEOS_SMB_CLIENT_SMB_SHARE_FINDER_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/chromeos/smb_client/discovery/host_locator.h"
+#include "chrome/browser/chromeos/smb_client/discovery/network_scanner.h"
+#include "chrome/browser/chromeos/smb_client/smb_url.h"
+#include "chromeos/dbus/smb_provider_client.h"
+
+namespace chromeos {
+namespace smb_client {
+
+// The callback that will be passed to GatherSharesInNetwork. The shares found
+// will have a format of "smb://host/share". This will be called once per host.
+using GatherSharesResponse =
+    base::RepeatingCallback<void(const std::vector<SmbUrl>& shares_gathered)>;
+
+// This class is responsible for finding hosts in a network and getting the
+// available shares for each host found.
+class SmbShareFinder : public base::SupportsWeakPtr<SmbShareFinder> {
+ public:
+  SmbShareFinder();
+  ~SmbShareFinder();
+
+  // Gathers the hosts in the network using |scanner_| and gets the shares for
+  // each of the hosts found. |callback| will be called once per host and will
+  // contain the paths to the shares found (e.g. "smb://host/share").
+  void GatherSharesInNetwork(GatherSharesResponse callback);
+
+  // Registers HostLocator |locator| to |scanner_|.
+  void RegisterHostLocator(std::unique_ptr<HostLocator> locator);
+
+ private:
+  // Handles the response from finding hosts in the network.
+  void OnHostsFound(GatherSharesResponse callback,
+                    bool success,
+                    const HostMap& hosts);
+
+  // Handles the response from getting shares for a given host.
+  void OnSharesFound(const std::string& host_name,
+                     GatherSharesResponse callback,
+                     smbprovider::ErrorType error,
+                     const smbprovider::DirectoryEntryListProto& entries);
+
+  NetworkScanner scanner_;
+
+  DISALLOW_COPY_AND_ASSIGN(SmbShareFinder);
+};
+
+}  // namespace smb_client
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_SMB_CLIENT_SMB_SHARE_FINDER_H_