Run LocalizeStrings() on plugin thread.

remoting/host/plugin/host_script_object.h

Index: remoting/host/plugin/host_script_object.h
diff --git a/remoting/host/plugin/host_script_object.h b/remoting/host/plugin/host_script_object.h
index 9172ada94d6d48e908c7b1b1c48aa15e7e5f3ec7..b67097ab74dbac52706617d92177a2081538bf4b 100644
--- a/remoting/host/plugin/host_script_object.h
+++ b/remoting/host/plugin/host_script_object.h
@@ -12,6 +12,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/cancellation_flag.h"
+#include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/string16.h"
 #include "base/threading/platform_thread.h"
@@ -20,6 +21,7 @@
 #include "remoting/host/chromoting_host_context.h"
 #include "remoting/host/host_status_observer.h"
 #include "remoting/host/plugin/host_plugin_utils.h"
+#include "remoting/host/ui_strings.h"
 #include "third_party/npapi/bindings/npapi.h"
 #include "third_party/npapi/bindings/npfunctions.h"
 #include "third_party/npapi/bindings/npruntime.h"
@@ -102,6 +104,12 @@ class HostNPScriptObject : public HostStatusObserver {
   // Disconnect. No arguments or result.
   bool Disconnect(const NPVariant* args, uint32_t argCount, NPVariant* result);
 
+  // Localize strings. args are:
+  //   localize_func - a callback function which returns a localized string for
+  //   a given tag name.
+  // No result.
+  bool Localize(const NPVariant* args, uint32_t argCount, NPVariant* result);
+
   // Call OnStateChanged handler if there is one.
   void OnStateChanged(State state);
 
@@ -130,13 +138,14 @@ class HostNPScriptObject : public HostStatusObserver {
   // Called when the nat traversal policy is updated.
   void OnNatPolicyUpdate(bool nat_traversal_enabled);
 
-  void LocalizeStrings();
+  void LocalizeStrings(NPObject* localize_func);
 
   // Helper function for executing InvokeDefault on an NPObject that performs
   // a string->string mapping with one optional substitution parameter. Stores
   // the translation in |result| and returns true on success, or leaves it
   // unchanged and returns false on failure.
-  bool LocalizeString(const char* tag, string16* result);
+  bool LocalizeString(NPObject* localize_func, const char* tag,
+                      string16* result);
 
   // Helper function for executing InvokeDefault on an NPObject, and ignoring
   // the return value.
@@ -153,7 +162,6 @@ class HostNPScriptObject : public HostStatusObserver {
   std::string access_code_;
   std::string client_username_;
   base::TimeDelta access_code_lifetime_;
-  ScopedRefNPObject localize_func_;
   ScopedRefNPObject log_debug_info_func_;
   ScopedRefNPObject on_state_changed_func_;
   base::PlatformThreadId np_thread_id_;
@@ -167,6 +175,9 @@ class HostNPScriptObject : public HostStatusObserver {
   scoped_refptr<ChromotingHost> host_;
   int failed_login_attempts_;
 
+  UiStrings ui_strings_;
+  base::Lock ui_strings_lock_;
+
   base::WaitableEvent disconnected_event_;
 
   scoped_ptr<policy_hack::NatPolicy> nat_policy_;