Implement the Blink part of the Device Motion API.

Source/Platform/chromium/public/WebDeviceMotionHandler.h

Index: Source/Platform/chromium/public/WebDeviceMotionHandler.h
diff --git a/Source/Platform/chromium/public/WebDeviceMotionHandler.h b/Source/Platform/chromium/public/WebDeviceMotionHandler.h
new file mode 100644
index 0000000000000000000000000000000000000000..06c1067a6d55afbead8df99da7c573701c2d26bb
--- /dev/null
+++ b/Source/Platform/chromium/public/WebDeviceMotionHandler.h
@@ -0,0 +1,50 @@
+/*
+ * 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 WebDeviceMotionHandler_h
+#define WebDeviceMotionHandler_h
+
+namespace WebKit {
+
+class WebDeviceMotionListener;
+
+// Abstract interface for the Device Motion API.

[abarth-chromium, 2013/05/06 17:04:17]

This comment doesn't really say anything interesting.  I would either remove it
or change it to explain what this class does.

[timvolodine, 2013/05/07 15:40:53]

Done.

+class WebDeviceMotionHandler {
+public:
+    // Will start distributing device motion data to the supplied listener.
+    virtual void startListeningToDeviceMotion(WebDeviceMotionListener*);
+
+    // Stops updating the current listener with device motion data.
+    virtual void stopListeningToDeviceMotion();
+};
+
+} // namespace WebKit
+
+#endif // WebDeviceMotionHandler_h