rollforward cr/2296923004 with fix: updated unittest to prevent issue with unreachable code (win_ch…

third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h

Index: third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
index 17c31580f266a8a390531897b224ecd63ce9900b..467bf8a9832f11fea567feaef9c984128d004a4b 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
+++ b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgent.h
@@ -14,6 +14,7 @@ namespace blink {
 
 class ExecutionContext;
 class LocalFrame;
+class Location;
 class InspectedFrames;
 
 // Inspector Agent for Web Performance APIs
@@ -22,6 +23,7 @@ class CORE_EXPORT InspectorWebPerfAgent final
     , public WebThread::TaskObserver
     , public scheduler::TaskTimeObserver {
     WTF_MAKE_NONCOPYABLE(InspectorWebPerfAgent);
+    friend class InspectorWebPerfAgentTest;
 public:
     explicit InspectorWebPerfAgent(InspectedFrames*);
     ~InspectorWebPerfAgent();
@@ -39,6 +41,7 @@ public:
 
 private:
     Member<InspectedFrames> m_inspectedFrames;
+    HeapHashSet<Member<Location>> m_frameContextLocations;
 };
 
 } // namespace blink