Implement Android shared memory data fetcher for Device Motion.

content/browser/device_orientation/device_motion_provider.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 "content/browser/device_orientation/device_motion_provider.h"
+
 #include "base/logging.h"
-#include "content/browser/device_orientation/device_motion_provider.h"
+#include "content/browser/device_orientation/data_fetcher_shared_memory.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);
   // TODO(timvolodine): consider not crashing the browser if the check fails.
   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;
-  // TODO(timvolodine): call data_fetcher_->StartFetchingDeviceMotionData(
-  // SharedMemoryAsHardwareBuffer());
+  if (!data_fetcher_)
+    data_fetcher_.reset(new DataFetcherSharedMemory);
+  data_fetcher_->StartFetchingDeviceMotionData(SharedMemoryAsHardwareBuffer());
   is_started_ = true;
 }
 
 void DeviceMotionProvider::StopFetchingDeviceMotionData() {
-  // TODO(timvolodine): call data_fetcher_->StopFetchingDeviceMotionData();
+  if (data_fetcher_)
+    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