Revert of Reland 2:Geolocation: move from content/browser to device/

content/public/browser/geolocation_provider.h

Index: content/public/browser/geolocation_provider.h
diff --git a/content/public/browser/geolocation_provider.h b/content/public/browser/geolocation_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..9d6524aeb9445fa0b6ca634b87c9ce8506730309
--- /dev/null
+++ b/content/public/browser/geolocation_provider.h
@@ -0,0 +1,71 @@
+// Copyright (c) 2012 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_PROVIDER_H_
+#define CONTENT_PUBLIC_BROWSER_GEOLOCATION_PROVIDER_H_
+
+#include <memory>
+
+#include "base/callback_list.h"
+#include "content/common/content_export.h"
+
+namespace content {
+class GeolocationDelegate;
+struct Geoposition;
+
+// This is the main API to the geolocation subsystem. The application will hold
+// a single instance of this class and can register multiple clients to be
+// notified of location changes:
+// * Callbacks are registered by AddLocationUpdateCallback() and will keep
+//   receiving updates until the returned subscription object is destructed.
+// The application must instantiate the GeolocationProvider on the UI thread and
+// must communicate with it on the same thread.
+// The underlying location arbitrator will only be enabled whilst there is at
+// least one registered observer or pending callback (and only after
+// UserDidOptIntoLocationServices). The arbitrator and the location providers it
+// uses run on a separate Geolocation thread.
+class GeolocationProvider {
+ public:
+  CONTENT_EXPORT static GeolocationProvider* GetInstance();
+
+  // Optional: provide a Delegate to override typical services.
+  CONTENT_EXPORT static void SetGeolocationDelegate(
+      GeolocationDelegate* delegate);
+
+  typedef base::Callback<void(const Geoposition&)> LocationUpdateCallback;
+  typedef base::CallbackList<void(const Geoposition&)>::Subscription
+      Subscription;
+
+  // |enable_high_accuracy| is used as a 'hint' for the provider preferences for
+  // this particular observer, however the observer could receive updates for
+  // best available locations from any active provider whilst it is registered.
+  virtual std::unique_ptr<Subscription> AddLocationUpdateCallback(
+      const LocationUpdateCallback& callback,
+      bool enable_high_accuracy) = 0;
+
+  // Calling this method indicates the user has opted into using location
+  // services, including sending network requests to [Google servers to] resolve
+  // the user's location. Use this method carefully, in line with the rules in
+  // go/chrome-privacy-doc.
+  virtual void UserDidOptIntoLocationServices() = 0;
+
+  // Overrides the current location for testing.
+  //
+  // Overrides the location for automation/testing. Suppresses any further
+  // updates from the actual providers and sends an update with the overridden
+  // position to all registered clients.
+  //
+  // Do not use this function in unit tests. The function instantiates the
+  // singleton geolocation stack in the background and manipulates it to report
+  // a fake location. Neither step can be undone, breaking unit test isolation
+  // (crbug.com/125931).
+  virtual void OverrideLocationForTesting(const Geoposition& position) = 0;
+
+ protected:
+  virtual~GeolocationProvider() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_GEOLOCATION_PROVIDER_H_