Add border API to surface control

See go/sf-box-shadows-api for more details

Bug: b/367464660
Flag: com.android.window.flags.enable_border_settings
Test: atest SurfaceFlinger_test
Change-Id: I1190edb97693004d9f46058fd0165451470a65b3
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 9854274..60a2bf7 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -2222,6 +2222,19 @@
     return *this;
 }
 
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setBorderSettings(
+        const sp<SurfaceControl>& sc, gui::BorderSettings settings) {
+    layer_state_t* s = getLayerState(sc);
+    if (!s) {
+        mStatus = BAD_INDEX;
+        return *this;
+    }
+
+    s->what |= layer_state_t::eBorderSettingsChanged;
+    s->borderSettings = settings;
+    return *this;
+}
+
 SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::setFrameRate(
         const sp<SurfaceControl>& sc, float frameRate, int8_t compatibility,
         int8_t changeFrameRateStrategy) {