Introduce 'TextCompositionCancel' for cancelComposition

third_party/WebKit/Source/core/editing/InputMethodController.cpp

Index: third_party/WebKit/Source/core/editing/InputMethodController.cpp
diff --git a/third_party/WebKit/Source/core/editing/InputMethodController.cpp b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
index 92edae82b2ed749dbd3568522b7a2ad71782d6ed..bae3cea1d0ff453dbdafaf3f688cb67b036bec9d 100644
--- a/third_party/WebKit/Source/core/editing/InputMethodController.cpp
+++ b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
@@ -84,9 +84,11 @@ void insertTextDuringCompositionWithEvents(
   DCHECK(compositionType ==
              TypingCommand::TextCompositionType::TextCompositionUpdate ||
          compositionType ==
-             TypingCommand::TextCompositionType::TextCompositionConfirm)
+             TypingCommand::TextCompositionType::TextCompositionConfirm ||
+         compositionType ==
+             TypingCommand::TextCompositionType::TextCompositionCancel)
       << "compositionType should be TextCompositionUpdate or "
-         "TextCompositionConfirm, but got "
+         "TextCompositionConfirm  or TextCompositionCancel, but got "
       << static_cast<int>(compositionType);
   if (!frame.document())
     return;
@@ -126,6 +128,7 @@ void insertTextDuringCompositionWithEvents(
                                 compositionType);
       break;
     case TypingCommand::TextCompositionType::TextCompositionConfirm:
+    case TypingCommand::TextCompositionType::TextCompositionCancel:
       // TODO(chongz): Use TypingCommand::insertText after TextEvent was
       // removed. (Removed from spec since 2012)
       // See TextEvent.idl.
@@ -379,7 +382,7 @@ void InputMethodController::cancelComposition() {
   dispatchCompositionUpdateEvent(frame(), emptyString());
   insertTextDuringCompositionWithEvents(
       frame(), emptyString(), 0,
-      TypingCommand::TextCompositionType::TextCompositionConfirm);
+      TypingCommand::TextCompositionType::TextCompositionCancel);
   // Event handler might destroy document.
   if (!isAvailable())
     return;