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 ac40ae2cd57e1655844c604f5a40a7442db8f6e2..1fdb1906e698fce08c82a64ab30087906ee1aef0 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -539,6 +539,12 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Clears browser cookies.
   virtual void ClearCookies(RenderViewHost* rvh) {}
 
+  // Disables / reenables network. |client_id| should be DevToolsAgentHost GUID.
+  virtual void DisableNetwork(
+      RenderViewHost* rvh,
+      const std::string& client_id,
+      bool disable) {}
+
   // Returns the default download directory.
   // This can be called on any thread.
   virtual base::FilePath GetDefaultDownloadDirectory();