Extract touchscreen device management into a generic manager

ui/ozone/ozone_platform.cc

 // Copyright 2013 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 "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
+#include "ui/events/device_data_manager.h"
 #include "ui/ozone/ozone_platform.h"
 #include "ui/ozone/ozone_switches.h"
 #include "ui/ozone/platform_object.h"
 #include "ui/ozone/platform_selection.h"
 
 namespace ui {
 
 namespace {
 
 bool g_platform_initialized_ui = false;
@@ skipping 13 matching lines @@
   instance_ = NULL;
 }
 
 // static
 void OzonePlatform::InitializeForUI() {
   CreateInstance();
   if (g_platform_initialized_ui)
     return;
   g_platform_initialized_ui = true;
   instance_->InitializeUI();
+  // This is deliberately created after initializing so that the platform can
+  // create its own version of DDM.
+  DeviceDataManager::CreateInstance();
 }
 
 // static
 void OzonePlatform::InitializeForGPU() {
   CreateInstance();
   if (g_platform_initialized_gpu)
     return;
   g_platform_initialized_gpu = true;
   instance_->InitializeGPU();
 }
@@ skipping 16 matching lines @@
 
     // TODO(spang): Currently need to leak this object.
     CHECK_EQ(instance_, platform.release());
   }
 }
 
 // static
 OzonePlatform* OzonePlatform::instance_;
 
 }  // namespace ui