Initial implementation of bindings and basic classes for worklets.

third_party/WebKit/Source/modules/worklet/WorkletGlobalScope.h

+// Copyright 2015 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.
+
+#ifndef WorkletGlobalScope_h
+#define WorkletGlobalScope_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/dom/ExecutionContextTask.h"
+#include "core/dom/SecurityContext.h"
+#include "core/inspector/ConsoleMessage.h"
+#include "core/inspector/ScriptCallStack.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class EventQueue;
+class IsolatedScriptController;
+
+class WorkletGlobalScope : public RefCountedWillBeNoBase<WorkletGlobalScope>, public SecurityContext, public ExecutionContext, public ScriptWrappable {

[haraken, 2016/01/05 06:08:06]

Doesn't WorkletGlobalScope need to be an EventTarget?

If it is not an EventTarget, you need to make the WorkletGlobalScope
RefCountedWillBeGarbageCollectedFinalized. The error will be caught by the GC
plugin, so please make sure that this CL compiles with
GYP_DEFINES='enable_oilpan=1 blink_gc_plugin=1'.

[ikilpatrick, 2016/01/07 22:47:35]

Done. Yeah it's not an event target at the moment. (This may change). As Worklet
code is callback based, events don't make sense.

+    DEFINE_WRAPPERTYPEINFO();
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(WorkletGlobalScope);
+public:
+#if !ENABLE(OILPAN)
+    using RefCounted<WorkletGlobalScope>::ref;
+    using RefCounted<WorkletGlobalScope>::deref;

[haraken, 2016/01/05 06:08:06]

This doesn't make sense if the WorkletGlobalScope doesn't inherit from
EventTarget...

[ikilpatrick, 2016/01/07 22:47:35]

Isn't this needed to disambiguate between RefCounted::{de,}ref &
ExecutionContext::{de,}ref?

[haraken, 2016/01/08 04:59:07]

Then it would be better to have:

#if !ENABLE(OILPAN)
    void refExecutionContext() final { ref(); }
    void derefExecutionContext() final { deref(); }
#endif

in a private section. See how WorkerGlobalScope (which inherits from RefCounted
and ExecutionContext) is implemented.

[ikilpatrick, 2016/01/11 04:13:19]

That is already defined in the private section below.

So I might be off-track here but:

RefCounted and ExecutionContext both define ref/deref, when stripping this you
get:
../../third_party/WebKit/Source/wtf/RefCounted.h:173:10: note: member found by
ambiguous name lookup
    void deref()
         ^
../../third_party/WebKit/Source/core/dom/ExecutionContext.h:135:10: note: member
found by ambiguous name lookup
    void deref() { derefExecutionContext(); }

 This adds in the equivalent of doing:
REFCOUNTED_EVENT_TARGET(WorkletGlobalScope);
(see
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...
)

Does that make sense?

+#endif
+
+    // The url and userAgent arguments are inherited from the parent
+    // ExecutionContext for Worklets.
+    static PassRefPtrWillBeRawPtr<WorkletGlobalScope> create(const KURL&, const String& userAgent, v8::Isolate*);
+    ~WorkletGlobalScope() override;
+
+    bool isWorkletGlobalScope() const final { return true; }
+
+    IsolatedScriptController* script();
+    v8::Isolate* isolate() const { return m_isolate; }
+
+    // ScriptWrappable
+    v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) final;
+    v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) final;
+
+    // ExecutionContext
+    void disableEval(const String& errorMessage) final;
+    String userAgent() const final { return m_userAgent; }
+    SecurityContext& securityContext() final { return *this; }
+    EventQueue* eventQueue() const final { ASSERT_NOT_REACHED(); return nullptr; } // WorkletGlobalScopes don't have an event queue.
+    bool isSecureContext(String& errorMessage, const SecureContextCheck = StandardSecureContextCheck) const final;
+
+    using SecurityContext::securityOrigin;
+    using SecurityContext::contentSecurityPolicy;
+
+    DOMTimerCoordinator* timers() final { ASSERT_NOT_REACHED(); return nullptr; } // WorkletGlobalScopes don't have timers.
+    void postTask(const WebTraceLocation&, PassOwnPtr<ExecutionContextTask>) override { }
+
+    // TODO(ikilpatrick): implement when we implement devtools support.
+    void reportBlockedScriptExecutionToInspector(const String& directiveText) final { }
+    void addConsoleMessage(PassRefPtrWillBeRawPtr<ConsoleMessage>) final { }
+    void logExceptionToConsole(const String& errorMessage, int scriptId, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack>) final { }
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+#if !ENABLE(OILPAN)
+    void refExecutionContext() final { ref(); }
+    void derefExecutionContext() final { deref(); }
+#endif
+
+    WorkletGlobalScope(const KURL&, const String& userAgent, v8::Isolate*);
+
+    const KURL& virtualURL() const final { return m_url; }
+    KURL virtualCompleteURL(const String&) const final;
+
+    EventTarget* errorEventTarget() final { return nullptr; }
+    void didUpdateSecurityOrigin() final { }
+
+    KURL m_url;
+    String m_userAgent;
+    v8::Isolate* m_isolate;

[haraken, 2016/01/05 06:08:06]

Remove this. You can use m_scriptState->isolate().

[ikilpatrick, 2016/01/07 22:47:35]

Done.

+    OwnPtrWillBeMember<IsolatedScriptController> m_script;
+};
+
+DEFINE_TYPE_CASTS(WorkletGlobalScope, ExecutionContext, context, context->isWorkletGlobalScope(), context.isWorkletGlobalScope());
+
+} // namespace blink
+
+#endif // WorkletGlobalScope_h