Move ScriptWrappable and dependencies to platform/bindings

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

-// Copyright 2016 The Chromium 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 "bindings/core/v8/ActiveScriptWrappable.h"
-
-#include "bindings/core/v8/DOMDataStore.h"
-#include "bindings/core/v8/ScriptWrappable.h"
-#include "bindings/core/v8/ScriptWrappableVisitor.h"
-#include "bindings/core/v8/V8Binding.h"
-#include "bindings/core/v8/V8PerIsolateData.h"
-#include "core/dom/ExecutionContext.h"
-
-namespace blink {
-
-ActiveScriptWrappableBase::ActiveScriptWrappableBase() {
-  DCHECK(ThreadState::Current());
-  v8::Isolate* isolate = ThreadState::Current()->GetIsolate();
-  V8PerIsolateData* isolate_data = V8PerIsolateData::From(isolate);
-  isolate_data->AddActiveScriptWrappable(this);
-}
-
-void ActiveScriptWrappableBase::TraceActiveScriptWrappables(
-    v8::Isolate* isolate,
-    ScriptWrappableVisitor* visitor) {
-  V8PerIsolateData* isolate_data = V8PerIsolateData::From(isolate);
-  auto active_script_wrappables = isolate_data->ActiveScriptWrappables();
-  if (!active_script_wrappables) {
-    return;
-  }
-
-  for (auto active_wrappable : *active_script_wrappables) {
-    if (!active_wrappable->DispatchHasPendingActivity(active_wrappable)) {
-      continue;
-    }
-
-    // A wrapper isn't kept alive after its ExecutionContext becomes
-    // detached, even if hasPendingActivity() returns |true|. This measure
-    // avoids memory leaks and has proven not to be too eager wrt
-    // garbage collection of objects belonging to discarded browser contexts
-    // ( https://html.spec.whatwg.org/#a-browsing-context-is-discarded )
-    //
-    // Consequently, an implementation of hasPendingActivity() is
-    // not required to take the detached state of the associated
-    // ExecutionContext into account (i.e., return |false|.) We probe
-    // the detached state of the ExecutionContext via
-    // |isContextDestroyed()|.
-    //
-    // TODO(haraken): Implement correct lifetime using traceWrapper.
-    if (active_wrappable->IsContextDestroyed(active_wrappable)) {
-      continue;
-    }
-
-    auto script_wrappable =
-        active_wrappable->ToScriptWrappable(active_wrappable);
-    auto wrapper_type_info =
-        const_cast<WrapperTypeInfo*>(script_wrappable->GetWrapperTypeInfo());
-    visitor->RegisterV8Reference(
-        std::make_pair(wrapper_type_info, script_wrappable));
-  }
-}
-
-}  // namespace blink