Check NaCl debug mask (not just flag) before choosing PNaCl debug URL.

components/nacl/browser/nacl_host_message_filter.cc

Index: components/nacl/browser/nacl_host_message_filter.cc
diff --git a/components/nacl/browser/nacl_host_message_filter.cc b/components/nacl/browser/nacl_host_message_filter.cc
index 9e852661bef4a08951fe0aefc7f600a76eb588e3..9389b704d56331b5ccfa04ae7e11f68f39f287bc 100644
--- a/components/nacl/browser/nacl_host_message_filter.cc
+++ b/components/nacl/browser/nacl_host_message_filter.cc
@@ -57,6 +57,8 @@ bool NaClHostMessageFilter::OnMessageReceived(const IPC::Message& message,
                                     OnOpenNaClExecutable)
     IPC_MESSAGE_HANDLER(NaClHostMsg_NaClGetNumProcessors,
                         OnNaClGetNumProcessors)
+    IPC_MESSAGE_HANDLER(NaClHostMsg_NaClDebugEnabledForURL,
+                        OnNaClDebugEnabledForURL)
 #endif
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
@@ -181,4 +183,10 @@ void NaClHostMessageFilter::OnOpenNaClExecutable(int render_view_id,
                                      reply_msg);
 }
 
+void NaClHostMessageFilter::OnNaClDebugEnabledForURL(const GURL& nmf_url,
+                                                     bool* should_debug) {
+  *should_debug =
+      nacl::NaClBrowser::GetDelegate()->URLMatchesDebugPatterns(nmf_url);
+}
+
 }  // namespace nacl