Support USB device hotplug on Android.

device/usb/usb_device_android.cc

 // Copyright 2015 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 "device/usb/usb_device_android.h"
 
 #include "base/android/build_info.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 67 matching lines @@
                                    const JavaRef<jobject>& wrapper)
     : UsbDevice(usb_version,
                 device_class,
                 device_subclass,
                 device_protocol,
                 vendor_id,
                 product_id,
                 device_version,
                 manufacturer_string,
                 product_string,
-                serial_number) {
+                serial_number),
+      device_id_(Java_ChromeUsbDevice_getDeviceId(env, wrapper.obj())) {
   j_object_.Reset(wrapper);
 
   if (base::android::BuildInfo::GetInstance()->sdk_int() >= 21) {
     ScopedJavaLocalRef<jobjectArray> configurations =
         Java_ChromeUsbDevice_getConfigurations(env, j_object_.obj());
     jsize count = env->GetArrayLength(configurations.obj());
     configurations_.reserve(count);
     for (jsize i = 0; i < count; ++i) {
       ScopedJavaLocalRef<jobject> config(
           env, env->GetObjectArrayElement(configurations.obj(), i));
@@ skipping 16 matching lines @@
           env, env->GetObjectArrayElement(interfaces.obj(), i));
       config.interfaces.push_back(UsbInterfaceAndroid::Convert(env, interface));
     }
     configurations_.push_back(config);
   }
 }
 
 UsbDeviceAndroid::~UsbDeviceAndroid() {}
 
 }  // namespace device