Migrate IRegionSamplingListener interface to AIDL

This addresses security vulnerabilities due to hard coded binder
interface.

Bug: 195660647
Test: (1) atest RegionSamplingTest
      (2) install Google I/O 2019 app, tap Agenda menu, scrolling to
      examine the bottom horizontal bar color changes
Change-Id: If2d33c5168b2df5fc7fd8f55e3bca75d3f385a89
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index b2baea6..e0c2aa7 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -45,6 +45,7 @@
 // retrieve wide-color and hdr settings from configstore
 using namespace android::hardware::configstore;
 using namespace android::hardware::configstore::V1_0;
+using gui::IRegionSamplingListener;
 using ui::ColorMode;
 
 using Transaction = SurfaceComposerClient::Transaction;