[Easy Unlock] Port the BluetoothConnectionFinder 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 23a8819c55b3a7341f7a9f34b5a66bbfb33c09f2..0a6fd119066826a733fdb658647491284be41188 100644
--- a/components/proximity_auth/BUILD.gn
+++ b/components/proximity_auth/BUILD.gn
@@ -6,11 +6,14 @@ source_set("proximity_auth") {
   sources = [
     "bluetooth_connection.cc",
     "bluetooth_connection.h",
+    "bluetooth_connection_finder.cc",
+    "bluetooth_connection_finder.h",
     "bluetooth_util.cc",
     "bluetooth_util_chromeos.cc",
     "bluetooth_util.h",
     "connection.cc",
     "connection.h",
+    "connection_finder.h",
     "connection_observer.h",
     "proximity_auth_system.cc",
     "proximity_auth_system.h",
@@ -30,6 +33,7 @@ source_set("unit_tests") {
   testonly = true
   sources = [
     "bluetooth_connection_unittest.cc",
+    "bluetooth_connection_finder_unittest.cc",
     "connection_unittest.cc",
     "proximity_auth_system_unittest.cc",
     "wire_message_unittest.cc",
@@ -48,11 +52,6 @@ source_set("unit_tests") {
 # Note: This is a convenience target for ease of rapid iteration during
 # development. It is not executed on any try or build bots.
 test("proximity_auth_unittests") {
-  sources = [
-    "run_all_unittests.cc",
-  ]
-  
-  deps = [
-    ":unit_tests",
-  ]
+  sources = [ "run_all_unittests.cc" ]
+  deps = [ ":unit_tests" ]
 }