Add some important profiling hooks.

platform/android/os_android.cpp

@@ -42,6 +42,7 @@
 #include "core/extension/gdextension_manager.h"
 #include "core/io/xml_parser.h"
 #include "core/os/main_loop.h"
+#include "core/profiling/profiling.h"
 #include "drivers/unix/dir_access_unix.h"
 #include "drivers/unix/file_access_unix.h"
 #ifdef TOOLS_ENABLED
@@ -356,6 +357,8 @@ void OS_Android::main_loop_begin() {
 }
 
 bool OS_Android::main_loop_iterate(bool *r_should_swap_buffers) {
+	GodotProfileFrameMark;
+	GodotProfileZone("OS_Android::main_loop_iterate");
 	if (!main_loop) {
 		return false;
 	}

platform/linuxbsd/os_linuxbsd.cpp

@@ -37,6 +37,7 @@
 #ifdef SDL_ENABLED
 #include "drivers/sdl/joypad_sdl.h"
 #endif
+#include "core/profiling/profiling.h"
 #include "main/main.h"
 #include "servers/display/display_server.h"
 #include "servers/rendering/rendering_server.h"
@@ -970,6 +971,8 @@ String OS_LinuxBSD::get_system_dir(SystemDir p_dir, bool p_shared_storage) const
 }
 
 void OS_LinuxBSD::run() {
+	GodotProfileFrameMark;
+	GodotProfileZone("OS_LinuxBSD::run");
 	if (!main_loop) {
 		return;
 	}

platform/macos/godot_content_view.mm

@@ -34,6 +34,7 @@
 #import "godot_window.h"
 #import "key_mapping_macos.h"
 
+#include "core/profiling/profiling.h"
 #include "main/main.h"
 
 @implementation GodotContentLayerDelegate
@@ -56,6 +57,9 @@
 - (void)displayLayer:(CALayer *)layer {
 	DisplayServerMacOS *ds = (DisplayServerMacOS *)DisplayServer::get_singleton();
 	if (OS::get_singleton()->get_main_loop() && ds->get_is_resizing() && need_redraw) {
+		GodotProfileFrameMark;
+		GodotProfileZone("[GodotContentLayerDelegate displayLayer]");
+
 		Main::force_redraw();
 		if (!Main::is_iterating()) { // Avoid cyclic loop.
 			Main::iteration();

platform/macos/os_macos.mm

@@ -1106,6 +1106,9 @@ void OS_MacOS_NSApp::start_main() {
 				pre_wait_observer = CFRunLoopObserverCreateWithHandler(kCFAllocatorDefault, kCFRunLoopBeforeWaiting, true, 0, ^(CFRunLoopObserverRef observer, CFRunLoopActivity activity) {
 					@autoreleasepool {
 						@try {
+							GodotProfileFrameMark;
+							GodotProfileZone("macOS main loop");
+
 							if (ds_mac) {
 								ds_mac->_process_events(false);
 							} else if (ds) {
@@ -1279,6 +1282,9 @@ void OS_MacOS_Embedded::run() {
 		while (true) {
 			@autoreleasepool {
 				@try {
+					GodotProfileFrameMark;
+					GodotProfileZone("macOS embedded main loop");
+
 					ds->process_events();
 
 #ifdef SDL_ENABLED

platform/web/os_web.cpp

@@ -40,6 +40,7 @@
 #include "core/debugger/engine_debugger.h"
 #include "core/io/file_access.h"
 #include "core/os/main_loop.h"
+#include "core/profiling/profiling.h"
 #include "drivers/unix/dir_access_unix.h"
 #include "drivers/unix/file_access_unix.h"
 #include "main/main.h"
@@ -79,6 +80,8 @@ void OS_Web::fs_sync_callback() {
 }
 
 bool OS_Web::main_loop_iterate() {
+	GodotProfileFrameMark;
+	GodotProfileZone("OS_Web::main_loop_iterate");
 	if (is_userfs_persistent() && idb_needs_sync && !idb_is_syncing) {
 		idb_is_syncing = true;
 		idb_needs_sync = false;

platform/windows/os_windows.cpp

@@ -39,6 +39,7 @@
 #include "core/debugger/script_debugger.h"
 #include "core/io/marshalls.h"
 #include "core/os/main_loop.h"
+#include "core/profiling/profiling.h"
 #include "core/version_generated.gen.h"
 #include "drivers/windows/dir_access_windows.h"
 #include "drivers/windows/file_access_windows.h"
@@ -2329,6 +2330,8 @@ void OS_Windows::run() {
 	main_loop->initialize();
 
 	while (true) {
+		GodotProfileFrameMark;
+		GodotProfileZone("OS_Windows::run");
 		DisplayServer::get_singleton()->process_events(); // get rid of pending events
 		if (Main::iteration()) {
 			break;