[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/platform/bindings/V8PerIsolateData.cpp

Index: third_party/WebKit/Source/platform/bindings/V8PerIsolateData.cpp
diff --git a/third_party/WebKit/Source/platform/bindings/V8PerIsolateData.cpp b/third_party/WebKit/Source/platform/bindings/V8PerIsolateData.cpp
index e9f59763e1d8b529a087d2ebbf12d64c4e4a18e3..147da325a796661544b9c719ea5d6368ffef03da 100644
--- a/third_party/WebKit/Source/platform/bindings/V8PerIsolateData.cpp
+++ b/third_party/WebKit/Source/platform/bindings/V8PerIsolateData.cpp
@@ -51,12 +51,17 @@ static void MicrotasksCompletedCallback(v8::Isolate* isolate) {
   V8PerIsolateData::From(isolate)->RunEndOfScopeTasks();
 }
 
-V8PerIsolateData::V8PerIsolateData(WebTaskRunner* task_runner)
+V8PerIsolateData::V8PerIsolateData(WebTaskRunner* task_runner,
+                                   intptr_t* table,
+                                   bool take_snapshot)
     : isolate_holder_(
           task_runner ? task_runner->ToSingleThreadTaskRunner() : nullptr,
           gin::IsolateHolder::kSingleThread,
           IsMainThread() ? gin::IsolateHolder::kDisallowAtomicsWait
-                         : gin::IsolateHolder::kAllowAtomicsWait),
+                         : gin::IsolateHolder::kAllowAtomicsWait,
+          table,
+          take_snapshot ? gin::IsolateHolder::kTakeSnapshot
+                        : gin::IsolateHolder::kDefault),
       string_cache_(WTF::WrapUnique(new StringCache(GetIsolate()))),
       private_property_(V8PrivateProperty::Create()),
       constructor_mode_(ConstructorMode::kCreateNewObject),
@@ -78,8 +83,11 @@ v8::Isolate* V8PerIsolateData::MainThreadIsolate() {
   return g_main_thread_per_isolate_data->GetIsolate();
 }
 
-v8::Isolate* V8PerIsolateData::Initialize(WebTaskRunner* task_runner) {
-  V8PerIsolateData* data = new V8PerIsolateData(task_runner);
+v8::Isolate* V8PerIsolateData::Initialize(WebTaskRunner* task_runner,
+                                          intptr_t* table,
+                                          bool take_snapshot) {
+  V8PerIsolateData* data =
+      new V8PerIsolateData(task_runner, table, take_snapshot);
   v8::Isolate* isolate = data->GetIsolate();
   isolate->SetData(gin::kEmbedderBlink, data);
   return isolate;
@@ -185,6 +193,29 @@ void V8PerIsolateData::SetInterfaceTemplate(
   map.insert(key, v8::Eternal<v8::FunctionTemplate>(GetIsolate(), value));
 }
 
+v8::Local<v8::FunctionTemplate> V8PerIsolateData::FindInterfaceTemplateTemp(
+    const DOMWrapperWorld& world,
+    const void* key) {
+  auto& map = interface_template_temp_map_;
+  auto result = map.find(key);
+  if (result != map.end())
+    return result->value.Get(GetIsolate());
+  return v8::Local<v8::FunctionTemplate>();
+}
+
+void V8PerIsolateData::SetInterfaceTemplateTemp(
+    const DOMWrapperWorld& world,
+    const void* key,
+    v8::Local<v8::FunctionTemplate> value) {
+  auto& map = interface_template_temp_map_;
+  map.insert(key, CopyablePersistent(GetIsolate(), value));
+}
+
+void V8PerIsolateData::ClearAll() {
+  interface_template_temp_map_.clear();
+  private_property_.reset();
+}
+
 const v8::Eternal<v8::Name>* V8PerIsolateData::FindOrCreateEternalNameCache(
     const void* lookup_key,
     const char* const names[],