Move string descriptor getters from UsbDeviceHandle to UsbDevice.

device/usb/usb_device.h

Index: device/usb/usb_device.h
diff --git a/device/usb/usb_device.h b/device/usb/usb_device.h
index f4bd5915467086be66671c7751e6347770d141f8..7ea964cce57ad0dab217f23e6cfe31459c503dff 100644
--- a/device/usb/usb_device.h
+++ b/device/usb/usb_device.h
@@ -9,6 +9,7 @@
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
+#include "base/strings/string16.h"
 
 namespace device {
 
@@ -54,6 +55,18 @@ class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
   // Blocking method. Must be called on FILE thread.
   virtual const UsbConfigDescriptor& GetConfiguration() = 0;
 
+  // Gets the manufacturer string of the device, or returns false.
+  // Blocking method. Must be called on FILE thread.
+  virtual bool GetManufacturer(base::string16* manufacturer) = 0;
+
+  // Gets the product string of the device, or returns false.
+  // Blocking method. Must be called on FILE thread.
+  virtual bool GetProduct(base::string16* product) = 0;
+
+  // Gets the serial number string of the device, or returns false.
+  // Blocking method. Must be called on FILE thread.
+  virtual bool GetSerialNumber(base::string16* serial) = 0;
+
   void AddObserver(Observer* obs) { observer_list_.AddObserver(obs); }
   void RemoveObserver(Observer* obs) { observer_list_.RemoveObserver(obs); }