Generalize and refactor DeviceSensorEvent* architecture to support multi-event type targets.

Source/core/frame/DeviceEventDispatcherBase.cpp

Index: Source/core/frame/DeviceEventDispatcherBase.cpp
diff --git a/Source/core/frame/DeviceSensorEventDispatcher.cpp b/Source/core/frame/DeviceEventDispatcherBase.cpp
similarity index 71%
copy from Source/core/frame/DeviceSensorEventDispatcher.cpp
copy to Source/core/frame/DeviceEventDispatcherBase.cpp
index a992f0aa2e5246d1cce865668bee49ce393a8975..ef64cd1a8d99c6124c32a7eeb36478f79d500dd8 100644
--- a/Source/core/frame/DeviceSensorEventDispatcher.cpp
+++ b/Source/core/frame/DeviceEventDispatcherBase.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -29,21 +29,24 @@
  */
 
 #include "config.h"
-#include "core/frame/DeviceSensorEventDispatcher.h"
+#include "core/frame/DeviceEventDispatcherBase.h"
+
+#include "core/frame/DeviceEventControllerBase.h"
+#include "wtf/TemporaryChange.h"
 
 namespace WebCore {
 
-DeviceSensorEventDispatcher::DeviceSensorEventDispatcher()
+DeviceEventDispatcherBase::DeviceEventDispatcherBase()
     : m_needsPurge(false)
     , m_isDispatching(false)
 {
 }
 
-DeviceSensorEventDispatcher::~DeviceSensorEventDispatcher()
+DeviceEventDispatcherBase::~DeviceEventDispatcherBase()
 {
 }
 
-void DeviceSensorEventDispatcher::addController(DeviceSensorEventController* controller)
+void DeviceEventDispatcherBase::addController(DeviceEventControllerBase* controller)
 {
     bool wasEmpty = m_controllers.isEmpty();
     if (!m_controllers.contains(controller))
@@ -52,13 +55,12 @@ void DeviceSensorEventDispatcher::addController(DeviceSensorEventController* con
         startListening();
 }
 
-void DeviceSensorEventDispatcher::removeController(DeviceSensorEventController* controller)
+void DeviceEventDispatcherBase::removeController(DeviceEventControllerBase* controller)
 {
     // Do not actually remove the controller from the vector, instead zero them out.
     // The zeros are removed in these two cases:
     // 1. either immediately if we are not dispatching any events,
-    // 2. or after events to all controllers have dispatched
-    // (see e.g. DeviceOrientationDispatcher::didChangeDeviceOrientation).
+    // 2. or after events to all controllers have dispatched (see notifyControllers()).
     // This is to correctly handle the re-entrancy case when a controller is destroyed
     // while the events are still being dispatched.
     size_t index = m_controllers.find(controller);
@@ -72,7 +74,7 @@ void DeviceSensorEventDispatcher::removeController(DeviceSensorEventController*
         purgeControllers();
 }
 
-void DeviceSensorEventDispatcher::purgeControllers()
+void DeviceEventDispatcherBase::purgeControllers()
 {
     ASSERT(m_needsPurge);
 
@@ -92,4 +94,20 @@ void DeviceSensorEventDispatcher::purgeControllers()
         stopListening();
 }
 
+void DeviceEventDispatcherBase::notifyControllers()
+{
+    {
+        TemporaryChange<bool> changeIsDispatching(m_isDispatching, true);
+        // Don't notify controllers removed or added during event dispatch.
+        size_t size = m_controllers.size();
+        for (size_t i = 0; i < size; ++i) {
+            if (m_controllers[i])
+                m_controllers[i]->didUpdateData();
+        }
+    }
+
+    if (m_needsPurge)
+        purgeControllers();
+}
+
 } // namespace WebCore