Move Device Sensors client files from Blink to //device/sensors client lib

device/sensors/public/cpp/motion_data.cc

+// Copyright 2013 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.
+
+#include "device/sensors/public/cpp/motion_data.h"
+
+#include <string.h>
+
+namespace device {
+
+MotionData::MotionData() {
+  // Make sure to zero out the memory so that there are no uninitialized bits.
+  // This object is used in the shared memory buffer and is memory copied by
+  // two processes. Valgrind will complain if we copy around memory that is
+  // only partially initialized.
+  memset(this, 0, sizeof(*this));
+}
+
+MotionData::MotionData(const MotionData& other) = default;
+
+}  // namespace device