Introduce WebInputMethodController to blink

components/test_runner/web_widget_test_client.cc

Index: components/test_runner/web_widget_test_client.cc
diff --git a/components/test_runner/web_widget_test_client.cc b/components/test_runner/web_widget_test_client.cc
index c38af4205d2721d2a65b6782e588728d8231df2a..f24c9f4235e2f2aa22e2990f665a4ba8785499e9 100644
--- a/components/test_runner/web_widget_test_client.cc
+++ b/components/test_runner/web_widget_test_client.cc
@@ -17,7 +17,11 @@
 #include "components/test_runner/web_view_test_proxy.h"
 #include "components/test_runner/web_widget_test_proxy.h"
 #include "third_party/WebKit/public/platform/WebScreenInfo.h"
+#include "third_party/WebKit/public/web/WebFrameWidget.h"
+#include "third_party/WebKit/public/web/WebInputMethodController.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebPagePopup.h"
+#include "third_party/WebKit/public/web/WebView.h"
 #include "third_party/WebKit/public/web/WebWidget.h"
 
 namespace test_runner {
@@ -103,9 +107,22 @@ void WebWidgetTestClient::setToolTipText(const blink::WebString& text,
 void WebWidgetTestClient::resetInputMethod() {
   // If a composition text exists, then we need to let the browser process
   // to cancel the input method's ongoing composition session.
-  if (web_widget_test_proxy_base_)
-    web_widget_test_proxy_base_->web_widget()->finishComposingText(
+  blink::WebFrameWidget* frame_widget = nullptr;
+  if (web_widget_test_proxy_base_ &&
+      web_widget_test_proxy_base_->web_widget()->isWebFrameWidget()) {
+    frame_widget = static_cast<blink::WebFrameWidget*>(
+        web_widget_test_proxy_base_->web_widget());
+  } else if (web_view_test_proxy_base_) {
+    blink::WebLocalFrame* main_frame =
+        web_view_test_proxy_base_->web_view()->mainFrame()->toWebLocalFrame();
+    DCHECK(main_frame);
+    frame_widget = mainFrame->frameWidget();
+  }
+
+  if (frame_widget && frame_widget->getActiveWebInputMethodController()) {
+    frame_widget->getActiveWebInputMethodController()->finishComposingText(
         blink::WebWidget::KeepSelection);
+  }
 }
 
 }  // namespace test_runner