[Easy Unlock] Port the BluetoothThrottler class to native code.

components/proximity_auth/BUILD.gn

Index: components/proximity_auth/BUILD.gn
diff --git a/components/proximity_auth/BUILD.gn b/components/proximity_auth/BUILD.gn
index 380459e62bf0fe7bd5eef11fb7fac384fee35706..7d31f678afaae07ac1c56e3e486a648757439280 100644
--- a/components/proximity_auth/BUILD.gn
+++ b/components/proximity_auth/BUILD.gn
@@ -10,6 +10,9 @@ source_set("proximity_auth") {
     "bluetooth_connection.h",
     "bluetooth_connection_finder.cc",
     "bluetooth_connection_finder.h",
+    "bluetooth_throttler.h",
+    "bluetooth_throttler_impl.cc",
+    "bluetooth_throttler_impl.h",
     "bluetooth_util.cc",
     "bluetooth_util.h",
     "bluetooth_util_chromeos.cc",
@@ -28,6 +31,8 @@ source_set("proximity_auth") {
     "secure_context.h",
     "switches.cc",
     "switches.h",
+    "throttled_bluetooth_connection_finder.cc",
+    "throttled_bluetooth_connection_finder.h",
     "wire_message.cc",
     "wire_message.h",
   ]
@@ -44,10 +49,12 @@ source_set("unit_tests") {
   sources = [
     "bluetooth_connection_finder_unittest.cc",
     "bluetooth_connection_unittest.cc",
+    "bluetooth_throttler_impl_unittest.cc",
     "client_unittest.cc",
     "connection_unittest.cc",
     "proximity_auth_system_unittest.cc",
     "remote_status_update_unittest.cc",
+    "throttled_bluetooth_connection_finder_unittest.cc",
     "wire_message_unittest.cc",
   ]