Implement the content/renderer and content/browser part of the Device Motion API.

content/browser/device_orientation/device_motion_provider.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 "base/logging.h"
+#include "content/browser/device_orientation/data_fetcher_impl_android.h"
+#include "content/browser/device_orientation/device_motion_provider.h"
+#include "content/common/device_motion_hardware_buffer.h"
+
+namespace content {
+
+DeviceMotionProvider::DeviceMotionProvider()
+    : is_started_(false) {
+  size_t data_size = sizeof(DeviceMotionHardwareBuffer);
+  bool res = device_motion_shared_memory_.CreateAndMapAnonymous(data_size);
+  CHECK(res);
+  DeviceMotionHardwareBuffer* hwbuf = SharedMemoryAsHardwareBuffer();
+  memset(hwbuf, 0, sizeof(DeviceMotionHardwareBuffer));
+}
+
+DeviceMotionProvider::~DeviceMotionProvider() {
+}
+
+base::SharedMemoryHandle DeviceMotionProvider::GetSharedMemoryHandleForProcess(
+    base::ProcessHandle process) {
+  base::SharedMemoryHandle renderer_handle;
+  device_motion_shared_memory_.ShareToProcess(process, &renderer_handle);
+  return renderer_handle;
+}
+
+void DeviceMotionProvider::StartFetchingDeviceMotionData() {
+  if (is_started_)
+    return;
+  if (!data_fetcher_.get()) {
+    // TODO(timvolodine) make this platform independent.
+    data_fetcher_.reset(DataFetcherImplAndroid::instance());
+  }
+  data_fetcher_->StartFetchingDeviceMotionData(SharedMemoryAsHardwareBuffer());
+  is_started_ = true;
+}
+
+void DeviceMotionProvider::StopFetchingDeviceMotionData() {
+  if (data_fetcher_.get())
+      data_fetcher_->StopFetchingDeviceMotionData();
+  is_started_ = false;
+}
+
+DeviceMotionHardwareBuffer* DeviceMotionProvider::
+    SharedMemoryAsHardwareBuffer() {
+  void* mem = device_motion_shared_memory_.memory();
+  CHECK(mem);
+  return static_cast<DeviceMotionHardwareBuffer*>(mem);
+}
+
+}  // namespace content