Add stop layer feature flag

Bug: 403312802
Flag: com.android.graphics.surfaceflinger.flags.stop_layer
Test: n/a - adds a feature flag
Change-Id: Ia58ff50ea780806e7a39ef5e4dfa59225b6b0c5c

Author: patrickdwilliams

services/surfaceflinger/common/FlagManager.cpp

@@ -175,6 +175,7 @@ void FlagManager::dump(std::string& result) const {
     DUMP_ACONFIG_FLAG(restore_blur_step);
     DUMP_ACONFIG_FLAG(skip_invisible_windows_in_input);
     DUMP_ACONFIG_FLAG(stable_edid_ids);
+    DUMP_ACONFIG_FLAG(stop_layer);
     DUMP_ACONFIG_FLAG(synced_resolution_switch);
     DUMP_ACONFIG_FLAG(trace_frame_rate_override);
     DUMP_ACONFIG_FLAG(true_hdr_screenshots);
@@ -297,6 +298,7 @@ FLAG_MANAGER_ACONFIG_FLAG(display_config_error_hal, "");
 FLAG_MANAGER_ACONFIG_FLAG(connected_display_hdr, "debug.sf.connected_display_hdr");
 FLAG_MANAGER_ACONFIG_FLAG(deprecate_frame_tracker, "");
 FLAG_MANAGER_ACONFIG_FLAG(skip_invisible_windows_in_input, "");
+FLAG_MANAGER_ACONFIG_FLAG(stop_layer, "");
 FLAG_MANAGER_ACONFIG_FLAG(begone_bright_hlg, "debug.sf.begone_bright_hlg");
 FLAG_MANAGER_ACONFIG_FLAG(window_blur_kawase2, "");
 FLAG_MANAGER_ACONFIG_FLAG(reject_dupe_layerstacks, "");

services/surfaceflinger/common/include/common/FlagManager.h

@@ -110,6 +110,7 @@ class FlagManager {
     bool restore_blur_step() const;
     bool skip_invisible_windows_in_input() const;
     bool stable_edid_ids() const;
+    bool stop_layer() const;
     bool synced_resolution_switch() const;
     bool trace_frame_rate_override() const;
     bool true_hdr_screenshots() const;

services/surfaceflinger/surfaceflinger_flags_new.aconfig

@@ -291,6 +291,14 @@ flag {
   is_fixed_read_only: true
 } # stable_edid_ids
 
+flag {
+    name: "stop_layer"
+    namespace: "window_surfaces"
+    description: "Enables stop layers when building layer snapshots"
+    bug: "403312802"
+    is_fixed_read_only: true
+} # stop_layer
+
 flag {
   name: "synced_resolution_switch"
   namespace: "core_graphics"