Expose the ServiceWorker's v8 context to embedders.

Source/web/WebEmbeddedWorkerImpl.h

Index: Source/web/WebEmbeddedWorkerImpl.h
diff --git a/Source/web/WebEmbeddedWorkerImpl.h b/Source/web/WebEmbeddedWorkerImpl.h
index 9ac972b452eff7b24645445231795403c4cc6683..cf52a7d66e5c07eee7a9e603c5f497f712ea3095 100644
--- a/Source/web/WebEmbeddedWorkerImpl.h
+++ b/Source/web/WebEmbeddedWorkerImpl.h
@@ -37,6 +37,7 @@
 #include "public/web/WebFrameClient.h"
 
 namespace WebCore {
+class ExecutionContextTask;
 class WorkerScriptLoader;
 class WorkerThread;
 }
@@ -57,6 +58,9 @@ public:
         PassOwnPtr<WebWorkerPermissionClientProxy>);
     virtual ~WebEmbeddedWorkerImpl();
 
+    // Posts the task to the worker thread, where it can safely access the worker's v8 context.
+    void postTask(PassOwnPtr<WebCore::ExecutionContextTask>);
+
     // WebEmbeddedWorker overrides.
     virtual void startWorkerContext(const WebEmbeddedWorkerStartData&) OVERRIDE;
     virtual void resumeAfterDownload() OVERRIDE;