Introducing chrome.usb.getDevices/openDevice API

chrome/browser/usb/usb_device.h

Index: chrome/browser/usb/usb_device.h
diff --git a/chrome/browser/usb/usb_device.h b/chrome/browser/usb/usb_device.h
index 8891ad0c53735236333935cfd2b9aff9563f6207..d89f679792fb7d22dd54e619db3d745debe5f2af 100644
--- a/chrome/browser/usb/usb_device.h
+++ b/chrome/browser/usb/usb_device.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
 #include "chrome/browser/usb/usb_interface.h"
@@ -28,6 +29,16 @@ class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
   PlatformUsbDevice platform_device() const { return platform_device_; }
   uint16 vendor_id() const { return vendor_id_; }
   uint16 product_id() const { return product_id_; }
+  uint32 unique_id() const { return unique_id_; }
+
+#if defined(OS_CHROMEOS)
+  // On ChromeOS, if an interface of a claimed device is not claimed, the
+  // permission broker can change the owner of the device so that the unclaimed
+  // interfaces can be used. If this argument is missing, permission broker will
+  // not be used and this method fails if the device is claimed.
+  virtual void RequestUsbAcess(
+      int interface_id, const base::Callback<void(bool success)>& callback);
+#endif  // OS_CHROMEOS
 
   // Creates a UsbDeviceHandle for further manipulation.
   // Blocking method. Must be called on FILE thread.
@@ -52,7 +63,8 @@ class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
   UsbDevice(scoped_refptr<UsbContext> context,
             PlatformUsbDevice platform_device,
             uint16 vendor_id,
-            uint16 product_id);
+            uint16 product_id,
+            uint32 unique_id);
 
   // Constructor called in test only.
   UsbDevice();
@@ -61,10 +73,20 @@ class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
   // Called only be UsbService.
   virtual void OnDisconnect();
 
+#if defined(OS_CHROMEOS)
+  // This method is called when permission broker replied our request.
+  // We will simply relay it to FILE thread.
+  // |callback| comes first because it will be base::Bind'ed.
+  void OnRequestUsbAccessReplied(
+      const base::Callback<void(bool success)>& callback,
+      bool success);
+#endif  // OS_CHROMEOS
+
  private:
   PlatformUsbDevice platform_device_;
   uint16 vendor_id_;
   uint16 product_id_;
+  uint32 unique_id_;
 
   // Retain the context so that it will not be released before UsbDevice.
   scoped_refptr<UsbContext> context_;