libgui: add sampling fns to SurfaceComposerClient

{add,remove}RegionSamplingListener was missing from
SurfaceComposerClient. Add them here to make the JNI
connection easier.

Test: boot
Test: atest CompositionSamplingListenerTest
Bug: 124305231
Change-Id: Ifd8833c25c112743524cee0ac5f2eae035011161
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 8c2538c..935fa5f 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -1464,6 +1464,19 @@
                                                                      outIsWideColorDisplay);
 }
 
+status_t SurfaceComposerClient::addRegionSamplingListener(
+        const Rect& samplingArea, const sp<IBinder>& stopLayerHandle,
+        const sp<IRegionSamplingListener>& listener) {
+    return ComposerService::getComposerService()->addRegionSamplingListener(samplingArea,
+                                                                            stopLayerHandle,
+                                                                            listener);
+}
+
+status_t SurfaceComposerClient::removeRegionSamplingListener(
+        const sp<IRegionSamplingListener>& listener) {
+    return ComposerService::getComposerService()->removeRegionSamplingListener(listener);
+}
+
 // ----------------------------------------------------------------------------
 
 status_t ScreenshotClient::capture(const sp<IBinder>& display, const ui::Dataspace reqDataSpace,