Read platform kernel blob from asset directory instead of FLX (#4471)

runtime/dart_init.cc

@@ -608,9 +608,10 @@ void InitDartVM(const uint8_t* vm_snapshot_data,
 #endif
 
   if (!bundle_path.empty()) {
-    auto zip_asset_store = fxl::MakeRefCounted<ZipAssetStore>(
-        GetUnzipperProviderForPath(std::move(bundle_path)));
-    zip_asset_store->GetAsBuffer(kPlatformKernelAssetKey, &platform_data);
+    fxl::RefPtr<blink::DirectoryAssetBundle> directory_asset_bundle =
+        fxl::MakeRefCounted<blink::DirectoryAssetBundle>(std::move(bundle_path));
+    directory_asset_bundle->GetAsBuffer(kPlatformKernelAssetKey,
+                                        &platform_data);
     if (!platform_data.empty()) {
       kernel_platform = Dart_ReadKernelBinary(
           platform_data.data(), platform_data.size(), ReleaseFetchedBytes);

runtime/dart_init.h

@@ -15,13 +15,13 @@
 
 namespace blink {
 
-// Name of the kernel blob asset within the FLX bundle.
+// Name of the kernel blob asset within the asset directory.
 extern const char kKernelAssetKey[];
 
-// Name of the snapshot blob asset within the FLX bundle.
+// Name of the snapshot blob asset within the asset directory.
 extern const char kSnapshotAssetKey[];
 
-// Name of the platform kernel blob asset within the FLX bundle.
+// Name of the platform kernel blob asset within the asset directory.
 extern const char kPlatformKernelAssetKey[];
 
 bool IsRunningPrecompiledCode();

shell/common/engine.cc

@@ -289,17 +289,9 @@ void Engine::Init(const std::string& bundle_path) {
 #error Unknown OS
 #endif
 
-  std::string flx_path = bundle_path;
-  struct stat stat_result = {};
-  if (::stat(flx_path.c_str(), &stat_result) == 0) {
-    if (S_ISDIR(stat_result.st_mode)) {
-      flx_path = files::GetDirectoryName(bundle_path) + "/app.flx";
-    }
-  }
-
   blink::InitRuntime(vm_snapshot_data, vm_snapshot_instr,
                      default_isolate_snapshot_data,
-                     default_isolate_snapshot_instr, flx_path);
+                     default_isolate_snapshot_instr, bundle_path);
 }
 
 const std::string Engine::main_entrypoint_ = "main";