Revert "Require V8 to be explicitly initialized before an Isolate is created"

src/v8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
 #include "src/base/once.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 15 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 V8_DECLARE_ONCE(init_once);
 
 v8::ArrayBuffer::Allocator* V8::array_buffer_allocator_ = NULL;
 v8::Platform* V8::platform_ = NULL;
 
 
-bool V8::Initialize() {
+bool V8::Initialize(Deserializer* des) {
   InitializeOncePerProcess();
-  return true;
+  Isolate* isolate = Isolate::UncheckedCurrent();
+  if (isolate == NULL) return true;
+  if (isolate->IsDead()) return false;
+  if (isolate->IsInitialized()) return true;
+
+  return isolate->Init(des);
 }
 
 
 void V8::TearDown() {
   Bootstrapper::TearDownExtensions();
   ElementsAccessor::TearDown();
   LOperand::TearDownCaches();
   compiler::Pipeline::TearDown();
   ExternalReference::TearDownMathExpData();
   RegisteredExtension::UnregisterAll();
@@ skipping 18 matching lines @@
   }
 
   if (FLAG_stress_compaction) {
     FLAG_force_marking_deque_overflows = true;
     FLAG_gc_global = true;
     FLAG_max_semi_space_size = 1;
   }
 
   base::OS::Initialize(FLAG_random_seed, FLAG_hard_abort, FLAG_gc_fake_mmap);
 
-  Isolate::InitializeOncePerProcess();
-
   Sampler::SetUp();
   CpuFeatures::Probe(false);
   init_memcopy_functions();
   // The custom exp implementation needs 16KB of lookup data; initialize it
   // on demand.
   init_fast_sqrt_function();
 #ifdef _WIN64
   init_modulo_function();
 #endif
   ElementsAccessor::InitializeOncePerProcess();
@@ skipping 22 matching lines @@
   platform_ = NULL;
 }
 
 
 v8::Platform* V8::GetCurrentPlatform() {
   DCHECK(platform_);
   return platform_;
 }
 
 } }  // namespace v8::internal