Revert "Refactor code listening to platform events in content/renderer/."

content/renderer/device_sensors/device_motion_event_pump.cc

 // Copyright 2014 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 "device_motion_event_pump.h"
 
 #include "content/common/device_sensors/device_motion_messages.h"
 #include "content/public/renderer/render_thread.h"
 #include "third_party/WebKit/public/platform/WebDeviceMotionListener.h"
 
 namespace content {
 
-DeviceMotionEventPump::DeviceMotionEventPump(RenderThread* thread)
-    : DeviceSensorEventPump<blink::WebDeviceMotionListener>(thread) {
+DeviceMotionEventPump::DeviceMotionEventPump()
+    : DeviceSensorEventPump(), listener_(0) {
+}
+
+DeviceMotionEventPump::DeviceMotionEventPump(int pump_delay_millis)
+    : DeviceSensorEventPump(pump_delay_millis), listener_(0) {
 }
 
 DeviceMotionEventPump::~DeviceMotionEventPump() {
 }
 
+bool DeviceMotionEventPump::SetListener(
+    blink::WebDeviceMotionListener* listener) {
+  listener_ = listener;
+  return listener_ ? RequestStart() : Stop();
+}
+
 bool DeviceMotionEventPump::OnControlMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(DeviceMotionEventPump, message)
     IPC_MESSAGE_HANDLER(DeviceMotionMsg_DidStartPolling, OnDidStart)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void DeviceMotionEventPump::FireEvent() {
-  DCHECK(listener());
+  DCHECK(listener_);
   blink::WebDeviceMotionData data;
   if (reader_->GetLatestData(&data) && data.allAvailableSensorsAreActive)
-    listener()->didChangeDeviceMotion(data);
+    listener_->didChangeDeviceMotion(data);
 }
 
 bool DeviceMotionEventPump::InitializeReader(base::SharedMemoryHandle handle) {
   if (!reader_)
     reader_.reset(new DeviceMotionSharedMemoryReader());
   return reader_->Initialize(handle);
 }
 
-void DeviceMotionEventPump::SendStartMessage() {
-  RenderThread::Get()->Send(new DeviceMotionHostMsg_StartPolling());
+bool DeviceMotionEventPump::SendStartMessage() {
+  return RenderThread::Get()->Send(new DeviceMotionHostMsg_StartPolling());
 }
 
-void DeviceMotionEventPump::SendStopMessage() {
-  RenderThread::Get()->Send(new DeviceMotionHostMsg_StopPolling());
-}
 
-void DeviceMotionEventPump::SendFakeDataForTesting(void* fake_data) {
-  blink::WebDeviceMotionData data =
-      *static_cast<blink::WebDeviceMotionData*>(fake_data);
-
-  listener()->didChangeDeviceMotion(data);
+bool DeviceMotionEventPump::SendStopMessage() {
+  return RenderThread::Get()->Send(new DeviceMotionHostMsg_StopPolling());
 }
 
 }  // namespace content