Move layout reload policy into platform api

src/layout.cpp

@@ -5,6 +5,7 @@
 #include "node.h"
 #include "node_border.h"
 #include "layout.h"
+#include "platform_api/asset_file_load_policy.h"
 
 void LayoutManager::unload()
 {
@@ -22,17 +23,13 @@ void LayoutManager::create()
 bool LayoutManager::load(const char* path)
 {
     auto abs_path = Asset::absolute(path);
-#if _WIN32 || __OSX__
-    struct stat tmp_info;
-    if (stat(abs_path.c_str(), &tmp_info) != 0)
-        return false;
-    if (tmp_info.st_mtime <= m_file_info.st_mtime)
-        return false;
-    m_file_info = tmp_info;
-#else
-    if (m_loaded)
-        return true; // already loaded
-#endif // __ANDROID__
+    const auto file_load = pp::platform::plan_asset_file_load(
+        abs_path,
+        m_loaded,
+        m_file_last_write_time);
+    if (!file_load.should_read_file)
+        return file_load.skipped_load_result;
+    m_file_last_write_time = file_load.last_write_time;
 
     if (!m_layouts.empty() && on_reloading)
         on_reloading();