[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp b/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
index cff7f2b161fc40ff6fd05cc7d66ba6c4efc02cee..7d3dd31a9a2186e21bd7385fe089b537589ae82a 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
@@ -28,6 +28,7 @@
 
 #include "bindings/core/v8/V8DOMConfiguration.h"
 
+#include "bindings/core/v8/V8SnapshotCreator.h"
 #include "platform/bindings/V8ObjectConstructor.h"
 #include "platform/bindings/V8PerContextData.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
@@ -702,16 +703,21 @@ v8::Local<v8::FunctionTemplate> V8DOMConfiguration::DomClassTemplate(
     WrapperTypeInfo* wrapper_type_info,
     InstallTemplateFunction configure_dom_class_template) {
   V8PerIsolateData* data = V8PerIsolateData::From(isolate);
-  v8::Local<v8::FunctionTemplate> result =
+  v8::Local<v8::FunctionTemplate> interface_template =
       data->FindInterfaceTemplate(world, wrapper_type_info);
-  if (!result.IsEmpty())
-    return result;
-
-  result = v8::FunctionTemplate::New(
-      isolate, V8ObjectConstructor::IsValidConstructorMode);
-  configure_dom_class_template(isolate, world, result);
-  data->SetInterfaceTemplate(world, wrapper_type_info, result);
-  return result;
+  if (!interface_template.IsEmpty())
+    return interface_template;
+
+  interface_template = V8SnapshotCreator::CreateInterfaceTemplate(

[Yuki, 2017/05/30 14:35:56]

nit: This seems not creating an interface template.
Extract, retrieve, get, deserialize, ... umm.
InterfaceTemplateFromSnapshot (following v8::FunctionTemplate::FromSnapshot) can
be an option (FromSnapshot could be redundant, though).

[peria, 2017/06/01 08:33:33]

Done.

+      isolate, world, wrapper_type_info);
+
+  if (interface_template.IsEmpty()) {
+    interface_template = v8::FunctionTemplate::New(
+        isolate, V8ObjectConstructor::IsValidConstructorMode);
+    configure_dom_class_template(isolate, world, interface_template);
+  }
+  data->SetInterfaceTemplate(world, wrapper_type_info, interface_template);
+  return interface_template;
 }
 
 void V8DOMConfiguration::SetClassString(