Update device/usb and its Mojo interface for variable size ISO packets.

extensions/browser/api/usb/usb_apitest.cc

Index: extensions/browser/api/usb/usb_apitest.cc
diff --git a/extensions/browser/api/usb/usb_apitest.cc b/extensions/browser/api/usb/usb_apitest.cc
index cc6b47b172d113a589422ad3869fe31a5e03dd1b..74b2eb52a481c1a2fe34768898cf2807fa92461c 100644
--- a/extensions/browser/api/usb/usb_apitest.cc
+++ b/extensions/browser/api/usb/usb_apitest.cc
@@ -48,6 +48,18 @@ ACTION_TEMPLATE(InvokeUsbTransferCallback,
   ::std::tr1::get<k>(args).Run(p1, io_buffer, 1);
 }
 
+ACTION_TEMPLATE(InvokeUsbIsochronousTransferCallback,
+                HAS_1_TEMPLATE_PARAMS(int, k),
+                AND_1_VALUE_PARAMS(p1)) {
+  net::IOBuffer* io_buffer = new net::IOBuffer(1);
+  memset(io_buffer->data(), 0, 1);  // Avoid uninitialized reads.
+  std::vector<UsbDeviceHandle::IsochronousPacket> packets(1);
+  packets[0].length = 1;
+  packets[0].transferred_length = 1;
+  packets[0].status = p1;
+  ::std::tr1::get<k>(args).Run(io_buffer, packets);
+}
+
 class TestDevicePermissionsPrompt
     : public DevicePermissionsPrompt,
       public DevicePermissionsPrompt::Prompt::Observer {
@@ -165,10 +177,9 @@ IN_PROC_BROWSER_TEST_F(UsbApiTest, TransferEvent) {
   EXPECT_CALL(*mock_device_handle_.get(),
               GenericTransfer(device::USB_DIRECTION_OUTBOUND, 2, _, 1, _, _))
       .WillOnce(InvokeUsbTransferCallback<5>(device::USB_TRANSFER_COMPLETED));
-  EXPECT_CALL(
-      *mock_device_handle_.get(),
-      IsochronousTransfer(device::USB_DIRECTION_OUTBOUND, 3, _, 1, 1, 1, _, _))
-      .WillOnce(InvokeUsbTransferCallback<7>(device::USB_TRANSFER_COMPLETED));
+  EXPECT_CALL(*mock_device_handle_.get(), IsochronousTransferOut(3, _, _, _, _))
+      .WillOnce(InvokeUsbIsochronousTransferCallback<4>(
+          device::USB_TRANSFER_COMPLETED));
   EXPECT_CALL(*mock_device_handle_.get(), Close()).Times(AnyNumber());
   ASSERT_TRUE(RunAppTest("api_test/usb/transfer_event"));
 }