[worklets] Introduce AnimationWorkletGlobalScope and ThreadedWorkletGlobalScope

third_party/WebKit/Source/modules/compositorworker/AnimationWorkletThread.cpp

Index: third_party/WebKit/Source/modules/compositorworker/AnimationWorkletThread.cpp
diff --git a/third_party/WebKit/Source/modules/compositorworker/AnimationWorkletThread.cpp b/third_party/WebKit/Source/modules/compositorworker/AnimationWorkletThread.cpp
index 45c73b5158bd389075756fa5c3c9743116f35990..5f67f152da4ee02523b4a6bf53f09b47cc628cbe 100644
--- a/third_party/WebKit/Source/modules/compositorworker/AnimationWorkletThread.cpp
+++ b/third_party/WebKit/Source/modules/compositorworker/AnimationWorkletThread.cpp
@@ -5,7 +5,9 @@
 #include "modules/compositorworker/AnimationWorkletThread.h"
 
 #include "core/workers/WorkerThreadStartupData.h"
+#include "modules/compositorworker/AnimationWorkletGlobalScope.h"
 #include "platform/TraceEvent.h"
+#include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/PtrUtil.h"
 
 namespace blink {
@@ -29,8 +31,14 @@ AnimationWorkletThread::~AnimationWorkletThread()
 WorkerOrWorkletGlobalScope* AnimationWorkletThread::createWorkerGlobalScope(std::unique_ptr<WorkerThreadStartupData> startupData)
 {
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("animation-worklet"), "AnimationWorkletThread::createWorkerGlobalScope");
-    // TODO(ikilpatrick): implement.
-    return nullptr;
+
+    RefPtr<SecurityOrigin> securityOrigin = SecurityOrigin::create(startupData->m_scriptURL);
+    if (startupData->m_starterOriginPrivilegeData)
+        securityOrigin->transferPrivilegesFrom(std::move(startupData->m_starterOriginPrivilegeData));
+
+    // TODO(ikilpatrick): The AnimationWorkletGlobalScope will need to store a
+    // WorkerClients object for using a CompositorProxyClient object.
+    return AnimationWorkletGlobalScope::create(startupData->m_scriptURL, startupData->m_userAgent, securityOrigin.release(), this->isolate(), this);
 }
 
 } // namespace blink