Remove unused V8 integration code in Sky

sky/engine/bindings/core/v8/WindowProxy.cpp

Index: sky/engine/bindings/core/v8/WindowProxy.cpp
diff --git a/sky/engine/bindings/core/v8/WindowProxy.cpp b/sky/engine/bindings/core/v8/WindowProxy.cpp
deleted file mode 100644
index eac81455ac6476ed6440b2cc34e337aff050cba4..0000000000000000000000000000000000000000
--- a/sky/engine/bindings/core/v8/WindowProxy.cpp
+++ /dev/null
@@ -1,304 +0,0 @@
-/*
- * Copyright (C) 2008, 2009, 2011 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "sky/engine/config.h"
-#include "sky/engine/bindings/core/v8/WindowProxy.h"
-
-#include <algorithm>
-#include <utility>
-
-#include "bindings/core/v8/V8Document.h"
-#include "bindings/core/v8/V8Window.h"
-#include "gen/sky/platform/RuntimeEnabledFeatures.h"
-#include "sky/engine/bindings/core/v8/DOMWrapperWorld.h"
-#include "sky/engine/bindings/core/v8/ScriptController.h"
-#include "sky/engine/bindings/core/v8/V8Binding.h"
-#include "sky/engine/bindings/core/v8/V8GCForContextDispose.h"
-#include "sky/engine/bindings/core/v8/V8HiddenValue.h"
-#include "sky/engine/bindings/core/v8/V8Initializer.h"
-#include "sky/engine/bindings/core/v8/V8ObjectConstructor.h"
-#include "sky/engine/core/frame/LocalFrame.h"
-#include "sky/engine/core/loader/FrameLoaderClient.h"
-#include "sky/engine/platform/ScriptForbiddenScope.h"
-#include "sky/engine/platform/TraceEvent.h"
-#include "sky/engine/public/platform/Platform.h"
-#include "sky/engine/wtf/Assertions.h"
-#include "sky/engine/wtf/OwnPtr.h"
-#include "sky/engine/wtf/StringExtras.h"
-#include "sky/engine/wtf/text/CString.h"
-#include "v8/include/v8-debug.h"
-#include "v8/include/v8.h"
-
-namespace blink {
-
-PassOwnPtr<WindowProxy> WindowProxy::create(LocalFrame* frame, DOMWrapperWorld& world, v8::Isolate* isolate)
-{
-    return adoptPtr(new WindowProxy(frame, &world, isolate));
-}
-
-WindowProxy::WindowProxy(LocalFrame* frame, PassRefPtr<DOMWrapperWorld> world, v8::Isolate* isolate)
-    : m_frame(frame)
-    , m_isolate(isolate)
-    , m_world(world)
-{
-}
-
-void WindowProxy::disposeContext(GlobalDetachmentBehavior behavior)
-{
-    if (!isContextInitialized())
-        return;
-
-    v8::HandleScope handleScope(m_isolate);
-    v8::Handle<v8::Context> context = m_scriptState->context();
-    m_frame->loaderClient()->willReleaseScriptContext(context);
-
-    if (behavior == DetachGlobal)
-        context->DetachGlobal();
-
-    m_scriptState->disposePerContextData();
-
-    // It's likely that disposing the context has created a lot of
-    // garbage. Notify V8 about this so it'll have a chance of cleaning
-    // it up when idle.
-    V8GCForContextDispose::instanceTemplate().notifyContextDisposed();
-}
-
-void WindowProxy::clearForClose()
-{
-    if (!isContextInitialized())
-        return;
-
-    m_document.clear();
-    disposeContext(DoNotDetachGlobal);
-}
-
-void WindowProxy::clearForNavigation()
-{
-    if (!isContextInitialized())
-        return;
-
-    ScriptState::Scope scope(m_scriptState.get());
-
-    m_document.clear();
-
-    v8::Handle<v8::Object> windowWrapper = V8Window::findInstanceInPrototypeChain(m_global.newLocal(m_isolate), m_isolate);
-    ASSERT(!windowWrapper.IsEmpty());
-    windowWrapper->TurnOnAccessCheck();
-    disposeContext(DetachGlobal);
-}
-
-// Create a new environment and setup the global object.
-//
-// The global object corresponds to a LocalDOMWindow instance. However, to
-// allow properties of the JS LocalDOMWindow instance to be shadowed, we
-// use a shadow object as the global object and use the JS LocalDOMWindow
-// instance as the prototype for that shadow object. The JS LocalDOMWindow
-// instance is undetectable from JavaScript code because the __proto__
-// accessors skip that object.
-//
-// The shadow object and the LocalDOMWindow instance are seen as one object
-// from JavaScript. The JavaScript object that corresponds to a
-// LocalDOMWindow instance is the shadow object. When mapping a LocalDOMWindow
-// instance to a V8 object, we return the shadow object.
-//
-// To implement split-window, see
-//   1) https://bugs.webkit.org/show_bug.cgi?id=17249
-//   2) https://wiki.mozilla.org/Gecko:SplitWindow
-//   3) https://bugzilla.mozilla.org/show_bug.cgi?id=296639
-// we need to split the shadow object further into two objects:
-// an outer window and an inner window. The inner window is the hidden
-// prototype of the outer window. The inner window is the default
-// global object of the context. A variable declared in the global
-// scope is a property of the inner window.
-//
-// The outer window sticks to a LocalFrame, it is exposed to JavaScript
-// via window.window, window.self, window.parent, etc. The outer window
-// has a security token which is the domain. The outer window cannot
-// have its own properties. window.foo = 'x' is delegated to the
-// inner window.
-//
-// When a frame navigates to a new page, the inner window is cut off
-// the outer window, and the outer window identify is preserved for
-// the frame. However, a new inner window is created for the new page.
-// If there are JS code holds a closure to the old inner window,
-// it won't be able to reach the outer window via its global object.
-bool WindowProxy::initializeIfNeeded()
-{
-    if (isContextInitialized())
-        return true;
-
-    DOMWrapperWorld::setWorldOfInitializingWindow(m_world.get());
-    bool result = initialize();
-    DOMWrapperWorld::setWorldOfInitializingWindow(0);
-    return result;
-}
-
-bool WindowProxy::initialize()
-{
-    TRACE_EVENT0("v8", "WindowProxy::initialize");
-    TRACE_EVENT_SCOPED_SAMPLING_STATE("blink", "InitializeWindow");
-
-    ScriptForbiddenScope::AllowUserAgentScript allowScript;
-
-    v8::HandleScope handleScope(m_isolate);
-
-    createContext();
-
-    if (!isContextInitialized())
-        return false;
-
-    ScriptState::Scope scope(m_scriptState.get());
-    v8::Handle<v8::Context> context = m_scriptState->context();
-    if (m_global.isEmpty()) {
-        m_global.set(m_isolate, context->Global());
-        if (m_global.isEmpty()) {
-            disposeContext(DoNotDetachGlobal);
-            return false;
-        }
-    }
-
-    if (!installDOMWindow()) {
-        disposeContext(DoNotDetachGlobal);
-        return false;
-    }
-
-    updateDocument();
-    m_frame->loaderClient()->didCreateScriptContext(context);
-    return true;
-}
-
-void WindowProxy::createContext()
-{
-    // Create a new environment using an empty template for the shadow
-    // object. Reuse the global object if one has been created earlier.
-    v8::Handle<v8::ObjectTemplate> globalTemplate = V8Window::getShadowObjectTemplate(m_isolate);
-    if (globalTemplate.IsEmpty())
-        return;
-
-    double contextCreationStartInSeconds = currentTime();
-
-    // Dynamically tell v8 about our extensions now.
-    const V8Extensions& extensions = ScriptController::registeredExtensions();
-    OwnPtr<const char*[]> extensionNames = adoptArrayPtr(new const char*[extensions.size()]);
-    int index = 0;
-    for (size_t i = 0; i < extensions.size(); ++i) {
-        extensionNames[index++] = extensions[i]->name();
-    }
-    v8::ExtensionConfiguration extensionConfiguration(index, extensionNames.get());
-
-    v8::Handle<v8::Context> context = v8::Context::New(m_isolate, &extensionConfiguration, globalTemplate, m_global.newLocal(m_isolate));
-    if (context.IsEmpty())
-        return;
-    m_scriptState = ScriptState::create(context, m_world);
-
-    double contextCreationDurationInMilliseconds = (currentTime() - contextCreationStartInSeconds) * 1000;
-    const char* histogramName = "WebCore.WindowProxy.createContext.MainWorld";
-    if (!m_world->isMainWorld())
-        histogramName = "WebCore.WindowProxy.createContext.IsolatedWorld";
-    blink::Platform::current()->histogramCustomCounts(histogramName, contextCreationDurationInMilliseconds, 0, 10000, 50);
-}
-
-static v8::Handle<v8::Object> toInnerGlobalObject(v8::Handle<v8::Context> context)
-{
-    return v8::Handle<v8::Object>::Cast(context->Global()->GetPrototype());
-}
-
-bool WindowProxy::installDOMWindow()
-{
-    LocalDOMWindow* window = m_frame->domWindow();
-    v8::Local<v8::Object> windowWrapper = V8ObjectConstructor::newInstance(m_isolate, m_scriptState->perContextData()->constructorForType(&V8Window::wrapperTypeInfo));
-    if (windowWrapper.IsEmpty())
-        return false;
-
-    V8DOMWrapper::setNativeInfoForHiddenWrapper(v8::Handle<v8::Object>::Cast(windowWrapper->GetPrototype()), &V8Window::wrapperTypeInfo, V8Window::toScriptWrappableBase(window));
-
-    // Install the windowWrapper as the prototype of the innerGlobalObject.
-    // The full structure of the global object is as follows:
-    //
-    // outerGlobalObject (Empty object, remains after navigation)
-    //   -- has prototype --> innerGlobalObject (Holds global variables, changes during navigation)
-    //   -- has prototype --> LocalDOMWindow instance
-    //   -- has prototype --> Window.prototype
-    //   -- has prototype --> Object.prototype
-    //
-    // Note: Much of this prototype structure is hidden from web content. The
-    //       outer, inner, and LocalDOMWindow instance all appear to be the same
-    //       JavaScript object.
-    //
-    // Note: With Oilpan, the LocalDOMWindow object is garbage collected.
-    //       Persistent references to this inner global object view of the LocalDOMWindow
-    //       aren't kept, as that would prevent the global object from ever being released.
-    //       It is safe not to do so, as the wrapper for the LocalDOMWindow being installed here
-    //       already keeps a persistent reference, and it along with the inner global object
-    //       views of the LocalDOMWindow will die together once that wrapper clears the persistent
-    //       reference.
-    v8::Handle<v8::Object> innerGlobalObject = toInnerGlobalObject(m_scriptState->context());
-    V8DOMWrapper::setNativeInfoForHiddenWrapper(innerGlobalObject, &V8Window::wrapperTypeInfo, V8Window::toScriptWrappableBase(window));
-    innerGlobalObject->SetPrototype(windowWrapper);
-    V8DOMWrapper::associateObjectWithWrapper<V8Window>(PassRefPtr<LocalDOMWindow>(window), &V8Window::wrapperTypeInfo, windowWrapper, m_isolate);
-    V8Window::installConditionallyEnabledProperties(windowWrapper, m_isolate);
-    return true;
-}
-
-void WindowProxy::updateDocumentWrapper(v8::Handle<v8::Object> wrapper)
-{
-    ASSERT(m_world->isMainWorld());
-    m_document.set(m_isolate, wrapper);
-}
-
-void WindowProxy::updateDocumentProperty()
-{
-    ScriptState::Scope scope(m_scriptState.get());
-    v8::Handle<v8::Context> context = m_scriptState->context();
-    v8::Handle<v8::Value> documentWrapper = toV8(m_frame->document(), context->Global(), context->GetIsolate());
-    ASSERT(documentWrapper == m_document.newLocal(m_isolate) || m_document.isEmpty());
-    if (m_document.isEmpty())
-        updateDocumentWrapper(v8::Handle<v8::Object>::Cast(documentWrapper));
-
-    ASSERT(documentWrapper->IsObject());
-    context->Global()->ForceSet(v8AtomicString(m_isolate, "document"), documentWrapper, static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
-
-    // We also stash a reference to the document on the inner global object so that
-    // LocalDOMWindow objects we obtain from JavaScript references are guaranteed to have
-    // live Document objects.
-    V8HiddenValue::setHiddenValue(m_isolate, toInnerGlobalObject(context), V8HiddenValue::document(m_isolate), documentWrapper);
-}
-
-void WindowProxy::updateDocument()
-{
-    ASSERT(m_world->isMainWorld());
-    if (!isGlobalInitialized())
-        return;
-    if (!isContextInitialized())
-        return;
-    updateDocumentProperty();
-}
-
-} // namespace blink