Implement the Blink part of the Device Motion API.

Source/core/platform/chromium/support/WebDeviceMotionDispatcher.h

Index: Source/core/platform/chromium/support/WebDeviceMotionDispatcher.h
diff --git a/Source/core/platform/chromium/support/WebDeviceMotionDispatcher.h b/Source/core/platform/chromium/support/WebDeviceMotionDispatcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..a67bc5fde240658e07105db6a6781ded14e48fbc
--- /dev/null
+++ b/Source/core/platform/chromium/support/WebDeviceMotionDispatcher.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WebDeviceMotionDispatcher_h
+#define WebDeviceMotionDispatcher_h
+
+#include <public/WebDeviceMotionListener.h>
+#include <wtf/HashCountedSet.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+class DeviceMotionController;
+class DeviceMotionData;
+}
+
+namespace WebKit {
+
+class WebDeviceMotionData;
+
+// This class listens to Device Motion data and dispatches it to all

[Peter Beverloo, 2013/04/29 17:38:03]

nit: s/Device Motion data/device motion data/.

[timvolodine, 2013/04/30 12:40:18]

Done.

+// interested controllers.
+

[Peter Beverloo, 2013/04/29 17:38:03]

nit: no newline.

[timvolodine, 2013/04/30 12:40:18]

Done.

+class WebDeviceMotionDispatcher : public WebDeviceMotionListener {
+public:
+    static WebDeviceMotionDispatcher& shared();
+
+    void addController(WebCore::DeviceMotionController*);
+    void removeController(WebCore::DeviceMotionController*);
+
+    // The returned pointer is owned by this class

[Peter Beverloo, 2013/04/29 17:38:03]

"Note that the returned object is owned by this class."

[timvolodine, 2013/04/30 12:40:18]

Done.

+    // FIXME: make the return value const, see crbug/233174.

[Peter Beverloo, 2013/04/29 17:38:03]

Please use a full URL instead of crbug/000.

[timvolodine, 2013/04/30 12:40:18]

Done.

+    WebCore::DeviceMotionData* latestDeviceMotionData();
+
+    // This method is called every time new motion data is available,
+    // which is passed in the argument.

[Peter Beverloo, 2013/04/29 17:38:03]

dito to my comment in WebDeviceMotionListener

[timvolodine, 2013/04/30 12:40:18]

Done.

+    void didChangeDeviceMotion(WebDeviceMotionData&) OVERRIDE;
+
+private:
+    WebDeviceMotionDispatcher();
+    ~WebDeviceMotionDispatcher();
+
+    void startListening();
+    void stopListening();
+
+    RefPtr<WebCore::DeviceMotionData> m_lastDeviceMotionData;
+    HashCountedSet<RefPtr<WebCore::DeviceMotionController> > m_controllers;
+};
+
+} // namespace WebCore
+
+#endif // WebDeviceMotionDispatcher_h