Reland of Add U2F request state machines

device/u2f/u2f_hid_device.cc

Index: device/u2f/u2f_hid_device.cc
diff --git a/device/u2f/u2f_hid_device.cc b/device/u2f/u2f_hid_device.cc
index 62eda924f55c390d157d72e9a2d1e3b143001880..64f446d4d9aa788acfc9d5b589637bfcef452678 100644
--- a/device/u2f/u2f_hid_device.cc
+++ b/device/u2f/u2f_hid_device.cc
@@ -26,6 +26,7 @@ U2fHidDevice::U2fHidDevice(scoped_refptr<HidDeviceInfo> device_info)
       device_info_(device_info),
       weak_factory_(this) {
   channel_id_ = kBroadcastChannel;
+  capabilities_ = 0;

[Reilly Grant (use Gerrit), 2017/04/24 21:07:49]

nit: combine these lines with the initialization of other member variables
above.

[Casey Piper, 2017/04/24 21:21:23]

Since the variables are from the base class, is there a way to initialize them
in the initialization list?

[Reilly Grant (use Gerrit), 2017/04/24 21:38:37]

Oh, I didn't realize they were in the base class. They should be initialized in
the base class constructor then.

[Casey Piper, 2017/04/24 22:52:53]

Done.

 }
 
 U2fHidDevice::~U2fHidDevice() {