Add ResolveProxy to the content API

content/public/renderer/render_thread.h

Index: content/public/renderer/render_thread.h
diff --git a/content/public/renderer/render_thread.h b/content/public/renderer/render_thread.h
index 353d38a16a98e470fc113c38074794d8a2d69deb..328a6bd22c2d44bf7bc423c64d906423a21f049d 100644
--- a/content/public/renderer/render_thread.h
+++ b/content/public/renderer/render_thread.h
@@ -15,6 +15,7 @@
 #include <windows.h>
 #endif
 
+class GURL;
 class MessageLoop;
 
 namespace base {
@@ -105,6 +106,11 @@ class CONTENT_EXPORT RenderThread : public IPC::Sender {
 
   virtual void UpdateHistograms(int sequence_number) = 0;
 
+  // Resolve the proxy servers to use for a given url. On success true is
+  // returned and |proxy_list| is set to a PAC string containing a list of
+  // proxy servers.
+  virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) = 0;
+
 #if defined(OS_WIN)
   // Request that the given font be loaded by the browser so it's cached by the
   // OS. Please see ChildProcessHost::PreCacheFont for details.