Introduce TsfEventRouter.

ui/base/win/tsf_bridge.cc

Index: ui/base/win/tsf_bridge.cc
diff --git a/ui/base/win/tsf_bridge.cc b/ui/base/win/tsf_bridge.cc
index 1db1f17f8d7d31623062a7e59e10cfe0e3355836..1d428def0c2b788de842a5fc0a5118c723756b5d 100644
--- a/ui/base/win/tsf_bridge.cc
+++ b/ui/base/win/tsf_bridge.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <msctf.h>
+
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ -183,6 +184,12 @@ class TsfBridgeDelegate : public TsfBridge {
     }
   }
 
+  virtual base::win::ScopedComPtr<ITfThreadMgr> GetThreadManager() OVERRIDE {
+    DCHECK_EQ(MessageLoop::TYPE_UI, MessageLoop::current()->type());
+    DCHECK(IsInitialized());
+    return thread_manager_;
+  }
+
  private:
   friend struct DefaultSingletonTraits<TsfBridgeDelegate>;