Fix race condition in DataFetcherSharedMemoryBase

content/browser/device_orientation/data_fetcher_shared_memory_android.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/data_fetcher_shared_memory.h"
 
 #include "base/logging.h"
 #include "content/browser/device_orientation/data_fetcher_impl_android.h"
 #include "content/common/device_motion_hardware_buffer.h"
 #include "content/common/device_orientation/device_orientation_hardware_buffer.h"
 
 namespace content {
 
 DataFetcherSharedMemory::DataFetcherSharedMemory() {
 }
 
 DataFetcherSharedMemory::~DataFetcherSharedMemory() {
 }
 
-bool DataFetcherSharedMemory::Start(ConsumerType consumer_type) {
-  void* buffer = GetSharedMemoryBuffer(consumer_type);
+bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
   DCHECK(buffer);
 
   switch (consumer_type) {
     case CONSUMER_TYPE_MOTION:
       return DataFetcherImplAndroid::GetInstance()->
           StartFetchingDeviceMotionData(
               static_cast<DeviceMotionHardwareBuffer*>(buffer));
     case CONSUMER_TYPE_ORIENTATION:
       return DataFetcherImplAndroid::GetInstance()->
           StartFetchingDeviceOrientationData(
@@ skipping 13 matching lines @@
       DataFetcherImplAndroid::GetInstance()->
           StopFetchingDeviceOrientationData();
       return true;
     default:
       NOTREACHED();
   }
   return false;
 }
 
 }  // namespace content