Add easyUnlockPrivate.getConnection API to allow querying for a Bluetooth connection's RSSI and TX power.

BUG=403419

Review URL: https://codereview.chromium.org/813303003

Cr-Commit-Position: refs/heads/master@{#310687}
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index 0e0f038..7e7064f 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -1004,6 +1004,7 @@
   BLUETOOTHPRIVATE_DISCONNECTALL,
   FILEMANAGERPRIVATE_GETMIMETYPE,
   USB_SETCONFIGURATION,
+  EASYUNLOCKPRIVATE_GETCONNECTIONINFO,
   // Last entry: Add new entries above and ensure to update
   // tools/metrics/histograms/histograms.xml.
   ENUM_BOUNDARY