Expose performance.memory in workers

Source/core/timing/MemoryInfo.h

Index: Source/core/timing/MemoryInfo.h
diff --git a/Source/core/timing/MemoryInfo.h b/Source/core/timing/MemoryInfo.h
index 59629a44dc8cf362f550bb2756e601d31bba0b00..890c374458b984bdf436f204715e146b72bed154 100644
--- a/Source/core/timing/MemoryInfo.h
+++ b/Source/core/timing/MemoryInfo.h
@@ -38,18 +38,19 @@
 
 namespace WebCore {
 
-class Frame;
+class ExecutionContext;
 
 class MemoryInfo : public RefCounted<MemoryInfo>, public ScriptWrappable {
 public:
-    static PassRefPtr<MemoryInfo> create(Frame* frame) { return adoptRef(new MemoryInfo(frame)); }
+    static PassRefPtr<MemoryInfo> create(ExecutionContext* context) { return adoptRef(new MemoryInfo(context)); }
 
     size_t totalJSHeapSize() const { return m_info.totalJSHeapSize; }
     size_t usedJSHeapSize() const { return m_info.usedJSHeapSize; }
     size_t jsHeapSizeLimit() const { return m_info.jsHeapSizeLimit; }
 
 private:
-    explicit MemoryInfo(Frame*);
+    explicit MemoryInfo(ExecutionContext*);
+    void loadMemoryInfo(bool);
 
     HeapInfo m_info;
 };