Implement Android shared memory data fetcher for Device Motion.

content/browser/device_orientation/data_fetcher_shared_memory_android.cc

+// Copyright (c) 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 "data_fetcher_shared_memory.h"
+
+#include "base/logging.h"
+#include "data_fetcher_impl_android.h"
+
+namespace content {
+
+DataFetcherSharedMemory::~DataFetcherSharedMemory() {
+  StopFetchingDeviceMotionData();
+}
+
+bool DataFetcherSharedMemory::NeedsPolling() {
+  return false;
+}
+
+bool DataFetcherSharedMemory::FetchDeviceMotionDataIntoBuffer() {
+  NOTREACHED();
+  return false;
+}
+
+bool DataFetcherSharedMemory::StartFetchingDeviceMotionData(
+    DeviceMotionHardwareBuffer* buffer) {
+  device_motion_buffer_ = buffer;

[bulach, 2013/07/12 16:07:43]

nit: as above..

[timvolodine, 2013/07/12 17:43:56]

here it's not really used but it is still needed in
data_fetcher_shared_memory_default. This is due to temporary nature of having
device motion using shared memory and device orientation working in the old way.

+  return DataFetcherImplAndroid::GetInstance()->
+      StartFetchingDeviceMotionData(buffer);
+}
+
+void DataFetcherSharedMemory::StopFetchingDeviceMotionData() {
+    DataFetcherImplAndroid::GetInstance()->StopFetchingDeviceMotionData();
+}
+
+}  // namespace content