Add chrome.usb.listInterfaces API

chrome/browser/extensions/api/usb/usb_api.h

Index: chrome/browser/extensions/api/usb/usb_api.h
diff --git a/chrome/browser/extensions/api/usb/usb_api.h b/chrome/browser/extensions/api/usb/usb_api.h
index 55b45d93c026155840a188c913610b8e69767467..318545fe68b7a3302a2ad8a3d896133900f5afe1 100644
--- a/chrome/browser/extensions/api/usb/usb_api.h
+++ b/chrome/browser/extensions/api/usb/usb_api.h
@@ -44,7 +44,7 @@ class UsbAsyncApiTransferFunction : public UsbAsyncApiFunction {
   virtual ~UsbAsyncApiTransferFunction();
 
   bool ConvertDirectionSafely(const extensions::api::usb::Direction& input,
-                              UsbDevice::TransferDirection* output);
+                              UsbInterfaceDirection* output);

[Bei Zhang, 2013/04/26 22:38:01]

I think direction is not a property of USB interface. This should be called
either UsbTransferDirection or UsbEndpointDirection.

[Kenny Root (Google), 2013/05/08 01:15:08]

Done.

   bool ConvertRequestTypeSafely(const extensions::api::usb::RequestType& input,
                                 UsbDevice::TransferRequestType* output);
   bool ConvertRecipientSafely(const extensions::api::usb::Recipient& input,
@@ -77,6 +77,38 @@ class UsbFindDevicesFunction : public UsbAsyncApiFunction {
   scoped_ptr<extensions::api::usb::FindDevices::Params> parameters_;
 };
 
+class UsbListInterfacesFunction : public UsbAsyncApiFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("usb.listInterfaces", USB_LISTINTERFACES)
+
+  UsbListInterfacesFunction();
+
+  static void SetDeviceForTest(UsbDevice* device);
+
+ protected:
+  virtual ~UsbListInterfacesFunction();
+
+  virtual bool Prepare() OVERRIDE;
+  virtual void AsyncWorkStart() OVERRIDE;
+
+ private:
+  void OnCompleted(bool success);
+
+  bool ConvertDirectionSafely(const UsbInterfaceDirection& input,
+                              extensions::api::usb::Direction* output);
+  bool ConvertEndpointTypeSafely(const UsbEndpointType& input,
+                                 extensions::api::usb::EndpointType* output);
+  bool ConvertSynchronizationTypeSafely(
+      const UsbSynchronizationType& input,
+      extensions::api::usb::SynchronizationType* output);
+  bool ConvertUsageTypeSafely(const UsbUsageType& input,
+                              extensions::api::usb::UsageType* output);
+
+  scoped_ptr<base::ListValue> result_;
+  scoped_refptr<UsbConfigDescriptor> config_;
+  scoped_ptr<extensions::api::usb::ListInterfaces::Params> parameters_;
+};
+
 class UsbCloseDeviceFunction : public UsbAsyncApiFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("usb.closeDevice", USB_CLOSEDEVICE)