Extract touchscreen device management into a generic manager

ui/ozone/ozone_platform.cc

Index: ui/ozone/ozone_platform.cc
diff --git a/ui/ozone/ozone_platform.cc b/ui/ozone/ozone_platform.cc
index 358556497938d2e4f7b04106c446b755b8d5cae8..35ee068028eeba99e88c04af6990ac77a8266882 100644
--- a/ui/ozone/ozone_platform.cc
+++ b/ui/ozone/ozone_platform.cc
@@ -5,6 +5,7 @@
 #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"
@@ -36,6 +37,7 @@ void OzonePlatform::InitializeForUI() {
   CreateInstance();
   if (g_platform_initialized_ui)
     return;
+  DeviceDataManager::CreateInstance();

[sadrul, 2014/06/18 16:18:14]

Do this after instance_->InitializeUI(), so that the platform-implementation has
a chance to create its own version of the DDM if it wants to.

[dnicoara, 2014/06/18 17:28:02]

Done.

   g_platform_initialized_ui = true;
   instance_->InitializeUI();
 }