Move touchscreen device caching to DeviceDataManager

ui/events/device_data_manager.cc

Index: ui/events/device_data_manager.cc
diff --git a/ui/events/device_data_manager.cc b/ui/events/device_data_manager.cc
index e7eb1147c8b339b741a0b6838ab8e87d93106621..d255b871abc80b10082d7408e92e25deafc7cb9a 100644
--- a/ui/events/device_data_manager.cc
+++ b/ui/events/device_data_manager.cc
@@ -7,6 +7,7 @@
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/logging.h"
+#include "ui/events/input_device_event_observer.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/point3_f.h"
 
@@ -108,4 +109,21 @@ int64_t DeviceDataManager::GetDisplayForTouchDevice(int touch_device_id) const {
   return gfx::Display::kInvalidDisplayID;
 }
 
+void DeviceDataManager::OnTouchscreenDevicesUpdated(
+    const std::vector<TouchscreenDevice>& devices) {
+  touchscreen_devices_ = devices;
+
+  FOR_EACH_OBSERVER(InputDeviceEventObserver,
+                    observers_,
+                    OnInputDeviceConfigurationChanged());
+}
+
+void DeviceDataManager::AddObserver(InputDeviceEventObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void DeviceDataManager::RemoveObserver(InputDeviceEventObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
 }  // namespace ui