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

content/renderer/device_sensors/device_light_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 "content/renderer/device_sensors/device_light_event_pump.h"
 
 #include "content/common/device_sensors/device_light_messages.h"
 #include "content/public/renderer/render_thread.h"
 #include "third_party/WebKit/public/platform/WebDeviceLightListener.h"
 
 namespace {
 // Default delay between subsequent firing of DeviceLight events.
 const int kDefaultLightPumpDelayMillis = 200;
 }  // namespace
 
 namespace content {
 
-DeviceLightEventPump::DeviceLightEventPump(RenderThread* thread)
-    : DeviceSensorEventPump<blink::WebDeviceLightListener>(thread),
+DeviceLightEventPump::DeviceLightEventPump()
+    : DeviceSensorEventPump(kDefaultLightPumpDelayMillis),
+      listener_(NULL),
       last_seen_data_(-1) {
-  pump_delay_millis_ = kDefaultLightPumpDelayMillis;
+}
+
+DeviceLightEventPump::DeviceLightEventPump(int pump_delay_millis)
+    : DeviceSensorEventPump(pump_delay_millis),
+      listener_(NULL),
+      last_seen_data_(-1) {
 }
 
 DeviceLightEventPump::~DeviceLightEventPump() {
 }
 
+bool DeviceLightEventPump::SetListener(
+    blink::WebDeviceLightListener* listener) {
+  listener_ = listener;
+  return listener_ ? RequestStart() : Stop();
+}
+
 bool DeviceLightEventPump::OnControlMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(DeviceLightEventPump, message)
-    IPC_MESSAGE_HANDLER(DeviceLightMsg_DidStartPolling, OnDidStart)
-    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_MESSAGE_HANDLER(DeviceLightMsg_DidStartPolling, OnDidStart)
+  IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void DeviceLightEventPump::FireEvent() {
-  DCHECK(listener());
+  DCHECK(listener_);
   DeviceLightData data;
   bool did_return_light_data = reader_->GetLatestData(&data);
   if (did_return_light_data && data.value != last_seen_data_) {
     last_seen_data_ = data.value;
-    listener()->didChangeDeviceLight(data.value);
+    listener_->didChangeDeviceLight(data.value);
   }
 }
 
 bool DeviceLightEventPump::InitializeReader(base::SharedMemoryHandle handle) {
   if (!reader_)
     reader_.reset(new DeviceLightSharedMemoryReader());
   return reader_->Initialize(handle);
 }
 
-void DeviceLightEventPump::SendStartMessage() {
-  RenderThread::Get()->Send(new DeviceLightHostMsg_StartPolling());
+bool DeviceLightEventPump::SendStartMessage() {
+  return RenderThread::Get()->Send(new DeviceLightHostMsg_StartPolling());
 }
 
-void DeviceLightEventPump::SendStopMessage() {
+bool DeviceLightEventPump::SendStopMessage() {
   last_seen_data_ = -1;
-  RenderThread::Get()->Send(new DeviceLightHostMsg_StopPolling());
-}
-
-void DeviceLightEventPump::SendFakeDataForTesting(void* fake_data) {
-  double data = *static_cast<double*>(fake_data);
-
-  listener()->didChangeDeviceLight(data);
+  return RenderThread::Get()->Send(new DeviceLightHostMsg_StopPolling());
 }
 
 }  // namespace content