[IME] Differentiate s_suppressNextKeypressEvent in WebViewImpl.

Source/web/WebViewImpl.h

Index: Source/web/WebViewImpl.h
diff --git a/Source/web/WebViewImpl.h b/Source/web/WebViewImpl.h
index 6048f2b8211a0eb431bd280068b608df9fd21025..96d0bea89b486a5e826bab2d4cb942270d529c4f 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -701,8 +701,14 @@ private:
     // Webkit expects keyPress events to be suppressed if the associated keyDown
     // event was handled. Safari implements this behavior by peeking out the
     // associated WM_CHAR event if the keydown was handled. We emulate
-    // this behavior by setting this flag if the keyDown was handled.
-    bool m_suppressNextKeypressEvent;
+    // this behavior by storing a state to indicate that keyDown has been handled,
+    // and so that the following keyPress event should be suppressed.
+    enum SuppressNextKeypressEvent {
+        Suppress_None, // Don't suppress.
+        Suppress_KeyEventCanceled, // Key event was canceled.
+        Suppress_KeyEventHandled // Key event was handled.
+    };
+    SuppressNextKeypressEvent m_suppressNextKeypressEvent;
 
     // Represents whether or not this object should process incoming IME events.
     bool m_imeAcceptEvents;