[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp b/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
index b9517bb7b0b0b823b2d98ea918473074ead2017a..378571aa2bd183eb80204ae0814645cfa246d7b1 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
@@ -40,6 +40,7 @@
 #include "bindings/core/v8/V8ErrorHandler.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8IdleTaskRunner.h"
+#include "bindings/core/v8/V8SnapshotCreator.h"
 #include "bindings/core/v8/WorkerOrWorkletScriptController.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
@@ -380,6 +381,9 @@ static void InitializeV8Common(v8::Isolate* isolate) {
   isolate->SetUseCounterCallback(&UseCounterCallback);
   isolate->SetWasmModuleCallback(WasmModuleOverride);
   isolate->SetWasmInstanceCallback(WasmInstanceOverride);
+
+  v8::HandleScope handle_scope(isolate);
+  V8SnapshotCreator::EnsureInterfaceTemplates(isolate);
 }
 
 namespace {
@@ -421,7 +425,7 @@ static void AdjustAmountOfExternalAllocatedMemory(int64_t diff) {
   v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(diff);
 }
 
-void V8Initializer::InitializeMainThread() {
+void V8Initializer::InitializeMainThread(bool take_snapshot) {
   DCHECK(IsMainThread());
 
   WTF::ArrayBufferContents::Initialize(AdjustAmountOfExternalAllocatedMemory);
@@ -434,14 +438,19 @@ void V8Initializer::InitializeMainThread() {
                                  v8_extras_mode, &array_buffer_allocator);
 
   // NOTE: Some threads (namely utility threads) don't have a scheduler.
-  WebScheduler* scheduler = Platform::Current()->CurrentThread()->Scheduler();
+  WebThread* thread = Platform::Current()->CurrentThread();
+  WebScheduler* scheduler = thread ? thread->Scheduler() : nullptr;
+
   // When timer task runner is used for PerIsolateData, GC tasks are getting
   // throttled and memory usage goes up. For now we're using loading task queue
   // to prevent this.
   // TODO(altimin): Consider switching to timerTaskRunner here.
   v8::Isolate* isolate = V8PerIsolateData::Initialize(
       scheduler ? scheduler->LoadingTaskRunner()
-                : Platform::Current()->CurrentThread()->GetWebTaskRunner());
+                : thread ? thread->GetWebTaskRunner() : nullptr,
+      V8SnapshotCreator::GetReferenceTable(),
+      take_snapshot ? V8PerIsolateData::V8ContextMode::kTakeSnapshot
+                    : V8PerIsolateData::V8ContextMode::kUseSnapshot);
 
   InitializeV8Common(isolate);