Geolocation: Extract GeolocationProvider::Delegate into GeolocationDelegate (no new code)

content/public/browser/geolocation_delegate.h

+// Copyright 2016 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 CONTENT_PUBLIC_BROWSER_GEOLOCATION_DELEGATE_H_
+#define CONTENT_PUBLIC_BROWSER_GEOLOCATION_DELEGATE_H_
+
+#include <memory>
+
+#include "content/common/content_export.h"
+
+namespace content {
+class AccessTokenStore;
+class LocationProvider;
+
+// An embedder of Geolocation may override these class' methods to provide
+// specific functionality.
+class CONTENT_EXPORT GeolocationDelegate {
+ public:
+  // Returns true if the location API should use network-based location
+  // approximation in addition to the system provider, if any.
+  virtual bool UseNetworkLocationProviders();
+   // Creates a new AccessTokenStore for geolocation. May return nullptr.
+  // TODO(mcasas): consider changing it return type to std::unique_ptr<> to
+  // clarify ownership, https://crbug.com/623114.
+  virtual AccessTokenStore* CreateAccessTokenStore();
+   // Allows an embedder to return its own LocationProvider implementation.
+  // Return nullptr to use the default one for the platform to be created.
+  // Caller takes ownership of the returned LocationProvider. FYI: Used by an
+  // external project; please don't remove. Contact Viatcheslav Ostapenko at
+  // sl.ostapenko@samsung.com for more information.
+  // TODO(mcasas): return std::unique_ptr<> instead, https://crbug.com/623132.
+  virtual LocationProvider* OverrideSystemLocationProvider();
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_GEOLOCATION_DELEGATE_H_