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..3da87b4e23bacfa05deee52f5584c6a129434c6b 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;
@@ -49,4 +52,18 @@ public class UsbInfo implements Serializable {
     public void revoke() {
         WebsitePreferenceBridge.nativeRevokeUsbPermission(mOrigin, mEmbedder, mObject);
     }
+
+    @Override
+    public int hashCode() {
+        return mObject.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof UsbInfo) {
+            UsbInfo other = (UsbInfo) obj;
+            return mObject.equals(other.mObject);
+        }
+        return false;
+    }
 }