Introduce WebInputMethodController to blink

components/test_runner/text_input_controller.h

Index: components/test_runner/text_input_controller.h
diff --git a/components/test_runner/text_input_controller.h b/components/test_runner/text_input_controller.h
index d7d29586b2effcc2b88bc66a09de5b67d4bb16b1..e566dcdb5400cedfd487e68d6bd27fb3fd110fc0 100644
--- a/components/test_runner/text_input_controller.h
+++ b/components/test_runner/text_input_controller.h
@@ -12,6 +12,7 @@
 #include "base/memory/weak_ptr.h"
 
 namespace blink {
+class WebInputMethodController;
 class WebLocalFrame;
 class WebView;
 }
@@ -45,6 +46,8 @@ class TextInputController {
   void SetComposition(const std::string& text);
 
   blink::WebView* view();
+  blink::WebInputMethodController* inputMethodController();
+
   WebViewTestProxyBase* web_view_test_proxy_base_;
 
   base::WeakPtrFactory<TextInputController> weak_factory_;