Use console.log to report NaCl errors in Chrome instead of alerts

src/trusted/plugin/ppapi/browser_interface_ppapi.h

Index: src/trusted/plugin/ppapi/browser_interface_ppapi.h
===================================================================
--- src/trusted/plugin/ppapi/browser_interface_ppapi.h	(revision 3042)
+++ src/trusted/plugin/ppapi/browser_interface_ppapi.h	(working copy)
@@ -42,9 +42,13 @@
                      const nacl::string& text);
 
   // Evaluate a JavaScript string in the browser.
-  virtual bool EvalString(InstanceIdentifier plugin_identifier,
+  virtual bool EvalString(InstanceIdentifier instance_id,
                           const nacl::string& handler_string);
 
+  // Write to the JavaScript console.
+  virtual bool AddToConsole(InstanceIdentifier instance_id,
+                            const nacl::string& text);
+
   // Gets the full URL of the current page.
   virtual bool GetFullURL(InstanceIdentifier instance_id,
                           nacl::string* full_url);