Remove idle screen refresh rate timeout flag

Bug: 407931776
Test: Builds successfully
Flag: EXEMPT flag deletion
Change-Id: Ib04f7ac87ae0392e9fb9259486e926bfa5d88d30

Author: Rupesh Bansal

services/surfaceflinger/Scheduler/RefreshRateSelector.cpp

@@ -1674,7 +1674,7 @@ void RefreshRateSelector::dump(utils::Dumper& dumper) const {
 }
 
 std::chrono::milliseconds RefreshRateSelector::getIdleTimerTimeout() {
-    if (FlagManager::getInstance().idle_screen_refresh_rate_timeout() && mIdleTimer) {
+    if (mIdleTimer) {
         return std::chrono::duration_cast<std::chrono::milliseconds>(mIdleTimer->interval());
     }
     return mConfig.legacyIdleTimerTimeout;

services/surfaceflinger/SurfaceFlinger.cpp

@@ -8189,13 +8189,9 @@ status_t SurfaceFlinger::setDesiredDisplayModeSpecs(const sp<IBinder>& displayTo
             return INVALID_OPERATION;
         } else {
             using Policy = scheduler::RefreshRateSelector::DisplayManagerPolicy;
-            const auto idleScreenConfigOpt =
-                    FlagManager::getInstance().idle_screen_refresh_rate_timeout()
-                    ? specs.idleScreenRefreshRateConfig
-                    : std::nullopt;
             const Policy policy{DisplayModeId(specs.defaultMode), translate(specs.primaryRanges),
                                 translate(specs.appRequestRanges), specs.allowGroupSwitching,
-                                idleScreenConfigOpt};
+                                specs.idleScreenRefreshRateConfig};
 
             return setDesiredDisplayModeSpecsInternal(display, policy);
         }

services/surfaceflinger/common/FlagManager.cpp

@@ -163,7 +163,6 @@ void FlagManager::dump(std::string& result) const {
     DUMP_ACONFIG_FLAG(graphite_renderengine);
     DUMP_ACONFIG_FLAG(hdcp_level_hal);
     DUMP_ACONFIG_FLAG(hdcp_negotiation);
-    DUMP_ACONFIG_FLAG(idle_screen_refresh_rate_timeout);
     DUMP_ACONFIG_FLAG(latch_unsignaled_with_auto_refresh_changed);
     DUMP_ACONFIG_FLAG(local_tonemap_screenshots);
     DUMP_ACONFIG_FLAG(misc1);
@@ -316,9 +315,6 @@ FLAG_MANAGER_ACONFIG_FLAG_IMPORTED(adpf_use_fmq_channel, "", android::os)
 FLAG_MANAGER_ACONFIG_FLAG_IMPORTED(correct_virtual_display_power_state, "",
                                    android::companion::virtualdevice::flags)
 
-/// Trunk stable readonly flags from outside SurfaceFlinger ///
-FLAG_MANAGER_ACONFIG_FLAG_IMPORTED(idle_screen_refresh_rate_timeout, "",
-                                   com::android::server::display::feature::flags)
 FLAG_MANAGER_ACONFIG_FLAG_IMPORTED(adpf_use_fmq_channel_fixed, "", android::os)
 FLAG_MANAGER_ACONFIG_FLAG_IMPORTED(trace_frame_rate_override, "",
                                    com::android::graphics::libgui::flags);

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

@@ -97,7 +97,6 @@ class FlagManager {
     bool graphite_renderengine() const;
     bool hdcp_level_hal() const;
     bool hdcp_negotiation() const;
-    bool idle_screen_refresh_rate_timeout() const;
     bool latch_unsignaled_with_auto_refresh_changed() const;
     bool local_tonemap_screenshots() const;
     bool luts_api() const;