device/fido: Add authenticator API to identify ChromeOSAuthenticator

Similar to IsWinNativeApiAuthenticator() and IsTouchIdAuthenticator(),
add IsChromeOSAuthenticator() which is only compiled on ChromeOS.

Bug: crbug:1115811, b:144861739
Change-Id: I80b88392e1c9edf501709ced7709db889370774b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357954
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#798346}

device/fido/cros/authenticator.cc

@@ -272,6 +272,10 @@ bool ChromeOSAuthenticator::RequiresBlePairingPin() const {
   return false;
 }
 
+bool ChromeOSAuthenticator::IsChromeOSAuthenticator() const {
+  return true;
+}
+
 base::WeakPtr<FidoAuthenticator> ChromeOSAuthenticator::GetWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }

device/fido/cros/authenticator.h

@@ -46,6 +46,8 @@ class COMPONENT_EXPORT(DEVICE_FIDO) ChromeOSAuthenticator
   bool IsPaired() const override;
   bool RequiresBlePairingPin() const override;
 
+  bool IsChromeOSAuthenticator() const override;
+
   void GetTouch(base::OnceClosure callback) override {}
   base::WeakPtr<FidoAuthenticator> GetWeakPtr() override;
 

device/fido/fido_authenticator.h

@@ -230,6 +230,9 @@ class COMPONENT_EXPORT(DEVICE_FIDO) FidoAuthenticator {
 #if defined(OS_MAC)
   virtual bool IsTouchIdAuthenticator() const = 0;
 #endif  // defined(OS_MAC)
+#if defined(OS_CHROMEOS)
+  virtual bool IsChromeOSAuthenticator() const = 0;
+#endif
   virtual base::WeakPtr<FidoAuthenticator> GetWeakPtr() = 0;
 
  private:

device/fido/fido_device_authenticator.cc

@@ -827,6 +827,12 @@ bool FidoDeviceAuthenticator::IsTouchIdAuthenticator() const {
 }
 #endif  // defined(OS_MAC)
 
+#if defined(OS_CHROMEOS)
+bool FidoDeviceAuthenticator::IsChromeOSAuthenticator() const {
+  return false;
+}
+#endif  // defined(OS_CHROMEOS)
+
 void FidoDeviceAuthenticator::SetTaskForTesting(
     std::unique_ptr<FidoTask> task) {
   task_ = std::move(task);

device/fido/fido_device_authenticator.h

@@ -113,6 +113,9 @@ class COMPONENT_EXPORT(DEVICE_FIDO) FidoDeviceAuthenticator
 #if defined(OS_MAC)
   bool IsTouchIdAuthenticator() const override;
 #endif  // defined(OS_MAC)
+#if defined(OS_CHROMEOS)
+  bool IsChromeOSAuthenticator() const override;
+#endif  // defined(OS_CHROMEOS)
   base::WeakPtr<FidoAuthenticator> GetWeakPtr() override;
 
   FidoDevice* device() { return device_.get(); }