[DevTools] Show sync XHR info during request loading.

Source/web/WebDevToolsAgentImpl.h

Index: Source/web/WebDevToolsAgentImpl.h
diff --git a/Source/web/WebDevToolsAgentImpl.h b/Source/web/WebDevToolsAgentImpl.h
index b092637f7cbecb585b91b0c830171584dfce0e4a..f7488748973ff4ffffbd6b3478113a96b2810828 100644
--- a/Source/web/WebDevToolsAgentImpl.h
+++ b/Source/web/WebDevToolsAgentImpl.h
@@ -32,6 +32,7 @@
 #define WebDevToolsAgentImpl_h
 
 #include "core/inspector/InspectorFrontendChannel.h"
+#include "core/inspector/InspectorResourceAgent.h"
 #include "core/inspector/InspectorRuntimeAgent.h"
 #include "core/inspector/InspectorStateClient.h"
 #include "core/inspector/InspectorTracingAgent.h"
@@ -70,6 +71,7 @@ class WebDevToolsAgentImpl final
     , public WebDevToolsAgent
     , public InspectorStateClient
     , public InspectorTracingAgent::Client
+    , public InspectorResourceAgent::Client
     , public InspectorRuntimeAgent::Client
     , public InspectorFrontendChannel
     , private WebThread::TaskObserver {
@@ -82,12 +84,14 @@ public:
     void willBeDestroyed();
     WebDevToolsAgentClient* client() { return m_client; }
     bool handleInputEvent(const WebInputEvent&);
-    void flushPendingProtocolNotifications();
     void dispatchMessageFromFrontend(const String& message);
     void registerAgent(PassOwnPtrWillBeRawPtr<InspectorAgent>);
     static void webViewImplClosed(WebViewImpl*);
     static void webFrameWidgetImplClosed(WebFrameWidgetImpl*);
 
+    // InspectorResourceAgent::Client implementation.
+    void flushPendingProtocolNotifications() override;
+
     // Instrumentation from web/ layer.
     void didCommitLoadForLocalFrame(LocalFrame*);
     bool screencastEnabled();