Worklet: Separate Worklet into MainThreadWorklet and ThreadedWorklet

third_party/WebKit/Source/core/workers/MainThreadWorklet.cpp

-// Copyright 2016 The Chromium Authors. All rights reserved.
+// Copyright 2017 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 "core/workers/Worklet.h"
+#include "core/workers/MainThreadWorklet.h"
 
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
 #include "core/workers/WorkletGlobalScopeProxy.h"
 #include "platform/wtf/WTF.h"
 
 namespace blink {
 
-Worklet::Worklet(LocalFrame* frame)
-    : ContextLifecycleObserver(frame->GetDocument()), frame_(frame) {}
+MainThreadWorklet::MainThreadWorklet(LocalFrame* frame) : Worklet(frame) {}
 
-ScriptPromise Worklet::import(ScriptState* script_state, const String& url) {
+ScriptPromise MainThreadWorklet::import(ScriptState* script_state,
+                                        const String& url) {
   DCHECK(IsMainThread());
   if (!GetExecutionContext()) {
     return ScriptPromise::RejectWithDOMException(
         script_state, DOMException::Create(kInvalidStateError,
                                            "This frame is already detached"));
   }
 
   KURL script_url = GetExecutionContext()->CompleteURL(url);
   if (!script_url.IsValid()) {
     return ScriptPromise::RejectWithDOMException(
         script_state, DOMException::Create(
                           kSyntaxError, "'" + url + "' is not a valid URL."));
   }
 
   if (!IsInitialized())
     Initialize();
 
   ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);
   ScriptPromise promise = resolver->Promise();
 
   WorkletScriptLoader* script_loader =
       WorkletScriptLoader::Create(frame_->GetDocument()->Fetcher(), this);
-  loader_and_resolvers_.Set(script_loader, resolver);
+  loader_to_resolver_map_.Set(script_loader, resolver);
   script_loader->FetchScript(script_url);
   return promise;
 }
 
-void Worklet::NotifyWorkletScriptLoadingFinished(
+void MainThreadWorklet::NotifyWorkletScriptLoadingFinished(
     WorkletScriptLoader* script_loader,
     const ScriptSourceCode& source_code) {
   DCHECK(IsMainThread());
-  ScriptPromiseResolver* resolver = loader_and_resolvers_.at(script_loader);
-  loader_and_resolvers_.erase(script_loader);
+  ScriptPromiseResolver* resolver = loader_to_resolver_map_.at(script_loader);
+  loader_to_resolver_map_.erase(script_loader);
 
   if (!script_loader->WasScriptLoadSuccessful()) {
     resolver->Reject(DOMException::Create(kNetworkError));
     return;
   }
 
   GetWorkletGlobalScopeProxy()->EvaluateScript(source_code);
   resolver->Resolve();
 }
 
-void Worklet::ContextDestroyed(ExecutionContext*) {
+void MainThreadWorklet::ContextDestroyed(ExecutionContext* execution_context) {
   DCHECK(IsMainThread());
-  if (IsInitialized())
-    GetWorkletGlobalScopeProxy()->TerminateWorkletGlobalScope();
-  for (const auto& script_loader : loader_and_resolvers_.Keys())
+  for (const auto& script_loader : loader_to_resolver_map_.Keys())
     script_loader->Cancel();
-  loader_and_resolvers_.Clear();
-  frame_ = nullptr;
+  loader_to_resolver_map_.Clear();
+  Worklet::ContextDestroyed(execution_context);
 }
 
-DEFINE_TRACE(Worklet) {
-  visitor->Trace(frame_);
-  visitor->Trace(loader_and_resolvers_);
-  ContextLifecycleObserver::Trace(visitor);
+DEFINE_TRACE(MainThreadWorklet) {
+  visitor->Trace(loader_to_resolver_map_);
+  Worklet::Trace(visitor);
 }
 
 }  // namespace blink