Implement basic USB device enumeration on Android.

device/usb/usb_configuration_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_configuration_android.h"
+
+#include "device/usb/usb_interface_android.h"
+#include "jni/ChromeUsbConfiguration_jni.h"
+
+using base::android::ScopedJavaLocalRef;
+
+namespace device {
+
+// static
+bool UsbConfigurationAndroid::RegisterJNI(JNIEnv* env) {
+  return RegisterNativesImpl(env);  // Generated in ChromeUsbConfiguration_jni.h
+}
+
+// static
+UsbConfigDescriptor UsbConfigurationAndroid::Convert(
+    JNIEnv* env,
+    const base::android::JavaRef<jobject>& usb_configuration) {
+  ScopedJavaLocalRef<jobject> wrapper =
+      Java_ChromeUsbConfiguration_create(env, usb_configuration.obj());
+
+  UsbConfigDescriptor config;
+  config.configuration_value =
+      Java_ChromeUsbConfiguration_getConfigurationValue(env, wrapper.obj());
+  config.self_powered =
+      Java_ChromeUsbConfiguration_isSelfPowered(env, wrapper.obj());
+  config.remote_wakeup =
+      Java_ChromeUsbConfiguration_isRemoteWakeup(env, wrapper.obj());
+  config.maximum_power =
+      Java_ChromeUsbConfiguration_getMaxPower(env, wrapper.obj());
+
+  ScopedJavaLocalRef<jobjectArray> interfaces =
+      Java_ChromeUsbConfiguration_getInterfaces(env, wrapper.obj());
+  jsize count = env->GetArrayLength(interfaces.obj());
+  config.interfaces.reserve(count);
+  for (jsize i = 0; i < count; ++i) {
+    ScopedJavaLocalRef<jobject> interface(
+        env, env->GetObjectArrayElement(interfaces.obj(), i));
+    config.interfaces.push_back(UsbInterfaceAndroid::Convert(env, interface));
+  }
+
+  return config;
+}
+
+}  // namespace device