Add Mojo IPC based input-device service.

ui/events/devices/input_device.cc

 // 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 "ui/events/devices/input_device.h"
 
 #include <string>
 
+#include "base/strings/stringprintf.h"
+
 namespace ui {
 
+namespace {
+
+std::string InputDeviceTypeString(InputDeviceType type) {
+#define ECASE(value) \
+  case value:        \
+    return #value
+  switch (type) {
+    ECASE(INPUT_DEVICE_INTERNAL);
+    ECASE(INPUT_DEVICE_EXTERNAL);
+    ECASE(INPUT_DEVICE_UNKNOWN);
+  }
+#undef ECASE
+}
+
+}  // namespace
+
 // static
 const int InputDevice::kInvalidId = 0;
 
 InputDevice::InputDevice()
     : id(kInvalidId), type(InputDeviceType::INPUT_DEVICE_UNKNOWN) {
 }
 
 InputDevice::InputDevice(int id, InputDeviceType type, const std::string& name)
     : id(id), type(type), name(name), vendor_id(0), product_id(0) {
 }
 
 InputDevice::InputDevice(int id,
                          InputDeviceType type,
                          const std::string& name,
                          const base::FilePath& sys_path,
                          uint16_t vendor,
                          uint16_t product)
     : id(id),
       type(type),
       name(name),
       sys_path(sys_path),
       vendor_id(vendor),
       product_id(product) {}
 
 InputDevice::InputDevice(const InputDevice& other) = default;
 
 InputDevice::~InputDevice() {
 }
 
+std::string InputDevice::ToString() const {
+  return base::StringPrintf("InputDevice[id=%d, name=\"%s\", type=%s]", id,
+                            name.c_str(), InputDeviceTypeString(type).c_str());
+}
+
 }  // namespace ui