Get all the UsbConfigDescriptor for the device configuration

device/usb/usb_device_impl.h

Index: device/usb/usb_device_impl.h
diff --git a/device/usb/usb_device_impl.h b/device/usb/usb_device_impl.h
index 3e9c8d0cc435455626918372c3cd96b9a9e23af4..56d783e5bd0718aa0e35bf446707a6adcd20cd0c 100644
--- a/device/usb/usb_device_impl.h
+++ b/device/usb/usb_device_impl.h
@@ -5,8 +5,6 @@
 #ifndef DEVICE_USB_USB_DEVICE_IMPL_H_
 #define DEVICE_USB_USB_DEVICE_IMPL_H_
 
-#include <vector>
-
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/threading/thread_checker.h"
@@ -42,7 +40,8 @@ class UsbDeviceImpl : public UsbDevice {
 #endif  // OS_CHROMEOS
   void Open(const OpenCallback& callback) override;
   bool Close(scoped_refptr<UsbDeviceHandle> handle) override;
-  const UsbConfigDescriptor* GetConfiguration() override;
+  const UsbConfigDescriptor* GetCurrentConfiguration() override;
+  const std::vector<UsbConfigDescriptor>& configurations() const override;
 
   // These functions are used during enumeration only. The values must not
   // change during the object's lifetime.
@@ -81,6 +80,7 @@ class UsbDeviceImpl : public UsbDevice {
   void RefreshConfiguration();
 
  private:
+  void GetAllConfigurations();
 #if defined(OS_CHROMEOS)
   void OnOpenRequestComplete(const OpenCallback& callback,
                              dbus::FileDescriptor fd);
@@ -103,6 +103,9 @@ class UsbDeviceImpl : public UsbDevice {
   // in an unconfigured state.
   scoped_ptr<UsbConfigDescriptor> configuration_;
 
+  // The device's all configuration descriptors.
+  std::vector<UsbConfigDescriptor> configurations_;
+
   // Retain the context so that it will not be released before UsbDevice.
   scoped_refptr<UsbContext> context_;