Build a basic Mojo service framework for device/usb

chrome/browser/chrome_device_client.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 "chrome/browser/chrome_device_client.h"
 
 #include "base/logging.h"
 #include "content/public/browser/browser_thread.h"
 #include "device/hid/hid_service.h"
+#include "device/usb/public/cpp/device_manager_delegate.h"
+#include "device/usb/public/cpp/device_manager_factory.h"
+#include "device/usb/public/interfaces/device.mojom.h"
 #include "device/usb/usb_service.h"
 
 using content::BrowserThread;
 
+namespace {
+
+// DeviceManagerDelegate implementation which allows access to all devices.
+class BrowserDeviceManagerDelegate : public device::usb::DeviceManagerDelegate {
+ public:
+  BrowserDeviceManagerDelegate() {}
+  ~BrowserDeviceManagerDelegate() override {}
+
+ private:
+  bool IsDeviceAllowed(const device::usb::DeviceInfo& device) override {
+    return true;
+  }
+};
+
+}  // namespace
+
 ChromeDeviceClient::ChromeDeviceClient() {}
 
 ChromeDeviceClient::~ChromeDeviceClient() {}
 
 device::UsbService* ChromeDeviceClient::GetUsbService() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   return device::UsbService::GetInstance(
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE));
 }
 
+void ChromeDeviceClient::ConnectToUSBDeviceManager(
+    mojo::InterfaceRequest<device::usb::DeviceManager> request) {
+  device::usb::DeviceManagerFactory::Build(
+      request.Pass(),
+      scoped_ptr<device::usb::DeviceManagerDelegate>(
+          new BrowserDeviceManagerDelegate));
+}
+
 device::HidService* ChromeDeviceClient::GetHidService() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   return device::HidService::GetInstance(
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE));
 }