Move PlatformEventDispatcher implementations to the Oilpan heap.

Source/modules/gamepad/GamepadDispatcher.cpp

 // 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 "config.h"
 #include "modules/gamepad/GamepadDispatcher.h"
 
 #include "modules/gamepad/NavigatorGamepad.h"
 #include "public/platform/Platform.h"
 #include "wtf/TemporaryChange.h"
 
 namespace blink {
 
 GamepadDispatcher& GamepadDispatcher::instance()
 {
-    DEFINE_STATIC_LOCAL(GamepadDispatcher, gamepadDispatcher, ());
-    return gamepadDispatcher;
+    DEFINE_STATIC_LOCAL(Persistent<GamepadDispatcher>, gamepadDispatcher, (new GamepadDispatcher()));
+    return *gamepadDispatcher;
 }
 
 void GamepadDispatcher::sampleGamepads(WebGamepads& gamepads)
 {
     Platform::current()->sampleGamepads(gamepads);
 }
 
 GamepadDispatcher::GamepadDispatcher()
 {
 }
 
 GamepadDispatcher::~GamepadDispatcher()
 {
 }
 
+void GamepadDispatcher::trace(Visitor* visitor)
+{
+    PlatformEventDispatcher::trace(visitor);
+}
+
 void GamepadDispatcher::didConnectGamepad(unsigned index, const WebGamepad& gamepad)
 {
     dispatchDidConnectOrDisconnectGamepad(index, gamepad, true);
 }
 
 void GamepadDispatcher::didDisconnectGamepad(unsigned index, const WebGamepad& gamepad)
 {
     dispatchDidConnectOrDisconnectGamepad(index, gamepad, false);
 }
 
@@ skipping 11 matching lines @@
 {
     Platform::current()->startListening(WebPlatformEventGamepad, this);
 }
 
 void GamepadDispatcher::stopListening()
 {
     Platform::current()->stopListening(WebPlatformEventGamepad);
 }
 
 } // namespace blink