Convert the async device ID getter to a chrome resource host

ppapi/examples/2d/paint_manager_example.cc

 // Copyright (c) 2011 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 "ppapi/c/pp_input_event.h"
 #include "ppapi/cpp/graphics_2d.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/input_event.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
+#include "ppapi/cpp/private/flash_device_id.h"

[yzshen1, 2012/09/11 00:53:17]

I think you are not going to commit this file, right?

 #include "ppapi/cpp/size.h"
 #include "ppapi/cpp/view.h"
+#include "ppapi/utility/completion_callback_factory.h"
 #include "ppapi/utility/graphics/paint_manager.h"
 
 // Number of pixels to each side of the center of the square that we draw.
 static const int kSquareRadius = 2;
 
 // We identify our square by the center point. This computes the rect for the
 // square given that point.
 pp::Rect SquareForPoint(int x, int y) {
   return PP_MakeRectFromXYWH(x - kSquareRadius, y - kSquareRadius,
                              kSquareRadius * 2 + 1, kSquareRadius * 2 + 1);
@@ skipping 12 matching lines @@
   }
 }
 
 class MyInstance : public pp::Instance, public pp::PaintManager::Client {
  public:
   MyInstance(PP_Instance instance)
       : pp::Instance(instance),
         paint_manager_(),
         last_x_(0),
         last_y_(0) {
+    factory_.Initialize(this);
+    device_id_ = pp::flash::DeviceID(this);
+
     paint_manager_.Initialize(this, this, false);
     RequestInputEvents(PP_INPUTEVENT_CLASS_MOUSE);
   }
 
+  pp::CompletionCallbackFactory<MyInstance> factory_;
+  pp::flash::DeviceID device_id_;
+
+  void GotDeviceID(int32_t result, const pp::Var& id) {
+    std::string value = id.AsString();
+    value.append("");
+  }
+
   virtual bool HandleInputEvent(const pp::InputEvent& event) {
     switch (event.GetType()) {
       case PP_INPUTEVENT_TYPE_MOUSEDOWN: {
+        device_id_.GetDeviceID(factory_.NewCallbackWithOutput(
+            &MyInstance::GotDeviceID));
+
         pp::MouseInputEvent mouse_event(event);
         // Update the square on a mouse down.
         if (mouse_event.GetButton() == PP_INPUTEVENT_MOUSEBUTTON_LEFT) {
           UpdateSquare(static_cast<int>(mouse_event.GetPosition().x()),
                        static_cast<int>(mouse_event.GetPosition().y()));
         }
         return true;
       }
       case PP_INPUTEVENT_TYPE_MOUSEMOVE: {
         pp::MouseInputEvent mouse_event(event);
@@ skipping 90 matching lines @@
 };
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp