Add the ability for DevTools to wrap network transactions.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 2fe20485aca85fb3d3b459752989b10c9d19cbf3..326ab3379f604e896c6622bdfef783e83d3a6db1 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -542,6 +542,12 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Clears browser cookies.
   virtual void ClearCookies(RenderViewHost* rvh) {}
 
+  // Disables / reenables network. |id| should be DevToolsAgentHost GUID.
+  virtual void DisableNetwork(
+      RenderViewHost* rvh,
+      const std::string& id,
+      bool disable) {}
+
   // Returns the default download directory.
   // This can be called on any thread.
   virtual base::FilePath GetDefaultDownloadDirectory();