Implement RenderWidgetHostViewBase::ImeCancelComposition for all Views (Aura Only)

content/browser/renderer_host/text_input_manager.h

Index: content/browser/renderer_host/text_input_manager.h
diff --git a/content/browser/renderer_host/text_input_manager.h b/content/browser/renderer_host/text_input_manager.h
index 39309a58342d79e126b7b0ad9d279d5f2ec8cbad..b5fde7f6dc39b13ad404320995bc8d8376e57d88 100644
--- a/content/browser/renderer_host/text_input_manager.h
+++ b/content/browser/renderer_host/text_input_manager.h
@@ -36,6 +36,11 @@ class CONTENT_EXPORT TextInputManager {
         TextInputManager* text_input_manager,
         RenderWidgetHostViewBase* updated_view,
         bool did_update_state) {}
+    // Called when |updated_view| has called ImeCancelComposition on
+    // TextInputManager.
+    virtual void OnImeCancelComposition(
+        TextInputManager* text_input_manager,
+        RenderWidgetHostViewBase* updated_view) {}
   };
 
   TextInputManager();
@@ -62,6 +67,10 @@ class CONTENT_EXPORT TextInputManager {
   void UpdateTextInputState(RenderWidgetHostViewBase* view,
                             const TextInputState& state);
 
+  // The current IME composition has been cancelled on the renderer side for
+  // the widget corresponding to |view|.
+  void ImeCancelComposition(RenderWidgetHostViewBase* view);
+
   // Registers the given |view| for tracking its TextInputState. This is called
   // by any view which has updates in its TextInputState (whether tab's RWHV or
   // that of a child frame). The |view| must unregister itself before being