Move sensors::Provider to content/public/browser and put it in the content namespace.

BUG=98716
R=jam@chromium.org
TBR=sky@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9370031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@121465 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 55 insertions, 0 deletions

diff --git a/content/public/browser/sensors_provider.h b/content/public/browser/sensors_provider.h
new file mode 100644
index 0000000..32da1f2
--- /dev/null
+++ b/content/public/browser/sensors_provider.h
@@ -0,0 +1,55 @@
+// 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_SENSORS_PROVIDER_H_
+#define CONTENT_PUBLIC_BROWSER_SENSORS_PROVIDER_H_
+#pragma once
+
+#include "content/common/content_export.h"
+#include "content/public/browser/sensors.h"
+
+// The sensors API will unify various types of sensor data into a set of
+// channels, each of which provides change events and periodic updates.
+//
+// This version of the API is intended only to support the experimental screen
+// rotation code and is not for general use. In particular, the final listener
+// will declare generic |OnSensorChanged| and |OnSensorUpdated| methods, rather
+// than the special-purpose |OnScreenOrientationChanged|.
+
+namespace content {
+
+class SensorsListener;
+
+// TODO(cwolfe): Finish defining the initial set of channels and replace this
+// with the generic sensor provider.
+class SensorsProvider {
+ public:
+  CONTENT_EXPORT static SensorsProvider* GetInstance();
+
+  // Adds a sensor listener. The listener will receive callbacks to indicate
+  // sensor changes and updates until it is removed.
+  //
+  // This method may be called in any thread. Callbacks on a listener will
+  // always be executed in the thread which added that listener.
+  virtual void AddListener(SensorsListener* listener) = 0;
+
+  // Removes a sensor listener.
+  //
+  // This method must be called in the same thread which added the listener.
+  // If the listener is not currently subscribed, this method may be called in
+  // any thread.
+  virtual void RemoveListener(SensorsListener* listener) = 0;
+
+  // Broadcasts a change to the coarse screen orientation.
+  //
+  // This method may be called in any thread.
+  virtual void ScreenOrientationChanged(ScreenOrientation change) = 0;
+
+ protected:
+  virtual ~SensorsProvider() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_SENSORS_PROVIDER_H_