Add a section to Site Settings listing USB devices.

chrome/android/java/src/org/chromium/chrome/browser/preferences/website/UsbInfo.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/website/UsbInfo.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/UsbInfo.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/UsbInfo.java
index c48aa1e67453b2924b4b259831a54ea7e39d0edf..58acb76de3b27e43701d583b31cfce50a72b6fcd 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/UsbInfo.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/website/UsbInfo.java
@@ -8,6 +8,9 @@ import java.io.Serializable;
 
 /**
  * USB device information for a given origin.
+ *
+ * These objects are compared only by the identity of the device, not by which site has permission
+ * to access it.
  */
 public class UsbInfo implements Serializable {
     private final String mOrigin;
@@ -44,6 +47,13 @@ public class UsbInfo implements Serializable {
     }
 
     /**
+     * Returns the opaque object string that represents the device.
+     */
+    public String getObject() {
+        return mObject;
+    }
+
+    /**
      * Revokes permission for the origin to access the USB device.
      */
     public void revoke() {