DevTools: Reenable the DOM storage agent on reattach.

BUG=378681

Review URL: https://codereview.chromium.org/304113003

git-svn-id: svn://svn.chromium.org/blink/trunk@175138 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/inspector/InspectorDOMStorageAgent.cpp

@@ -89,6 +89,12 @@ void InspectorDOMStorageAgent::clearFrontend()
     disable(0);
 }
 
+void InspectorDOMStorageAgent::restore()
+{
+    if (isEnabled())
+        enable(0);
+}
+
 bool InspectorDOMStorageAgent::isEnabled() const
 {
     return m_state->getBoolean(DOMStorageAgentState::domStorageAgentEnabled);

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

@@ -56,6 +56,7 @@ public:
 
     virtual void setFrontend(InspectorFrontend*) OVERRIDE;
     virtual void clearFrontend() OVERRIDE;
+    virtual void restore() OVERRIDE;
 
     // Called from the front-end.
     virtual void enable(ErrorString*) OVERRIDE;