Implement Android shared memory data fetcher for Device Motion.

content/browser/device_orientation/data_fetcher_impl_win.cc

Index: content/browser/device_orientation/data_fetcher_impl_win.cc
diff --git a/content/browser/device_orientation/data_fetcher_impl_win.cc b/content/browser/device_orientation/data_fetcher_impl_win.cc
index d08ed446ad623f4c8e577cc7fd97fdf01f14f559..6debc99904c4c5c37eb8e62a4f6da8f77315c0b1 100644
--- a/content/browser/device_orientation/data_fetcher_impl_win.cc
+++ b/content/browser/device_orientation/data_fetcher_impl_win.cc
@@ -101,25 +101,34 @@ class DataFetcherImplWin::SensorEventSink : public ISensorEvents,
   DISALLOW_COPY_AND_ASSIGN(SensorEventSink);
 };
 
+DataFetcherImplWin* DataFetcherImplWin::instance() {
+  CR_DEFINE_STATIC_LOCAL(DataFetcherImplWin, s_data_fetcher, ());
+  return &s_data_fetcher;
+}
+
 // Create a DataFetcherImplWin object and return NULL if no valid sensor found.
 // static
 DataFetcher* DataFetcherImplWin::Create() {
-  scoped_ptr<DataFetcherImplWin> fetcher(new DataFetcherImplWin);
+  DataFetcherImplWin* fetcher = DataFetcherImplWin::instance();
   if (fetcher->Initialize())
-    return fetcher.release();
+    return fetcher;
 
   LOG(ERROR) << "DataFetcherImplWin::Initialize failed!";
   return NULL;
 }
 
 DataFetcherImplWin::~DataFetcherImplWin() {
-  if (sensor_)
-    sensor_->SetEventSink(NULL);
+  Stop();
 }
 
 DataFetcherImplWin::DataFetcherImplWin() {
 }
 
+void DataFetcherImplWin::Stop() {
+  if (sensor_)
+    sensor_->SetEventSink(NULL);
+}
+
 void DataFetcherImplWin::OnOrientationData(Orientation* orientation) {
   // This method is called on Windows sensor thread.
   base::AutoLock autolock(next_orientation_lock_);