[InputEvent] Fire 'beforeinput' during typing, pressing hot keys and IME composition

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

Index: third_party/WebKit/Source/core/editing/EditorKeyBindings.cpp
diff --git a/third_party/WebKit/Source/core/editing/EditorKeyBindings.cpp b/third_party/WebKit/Source/core/editing/EditorKeyBindings.cpp
index 5b7dd0e1a3e4376187624a221a4a81cb560c1320..692e883639d9fa920e51e74715a8255fe578254d 100644
--- a/third_party/WebKit/Source/core/editing/EditorKeyBindings.cpp
+++ b/third_party/WebKit/Source/core/editing/EditorKeyBindings.cpp
@@ -26,6 +26,7 @@
 
 #include "core/editing/Editor.h"
 
+#include "core/editing/EditingUtilities.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/frame/LocalFrame.h"
 #include "core/page/EditorClient.h"
@@ -60,6 +61,10 @@ bool Editor::handleEditingKeyboardEvent(KeyboardEvent* evt)
     if (!behavior().shouldInsertCharacter(*evt) || !canEdit())
         return false;
 
+    // Return true to prevent default action. e.g. Space key scroll.
+    if (dispatchBeforeInputInsertText(evt->target(), evt->keyEvent()->text()) != DispatchEventResult::NotCanceled)
+        return true;
+
     return insertText(evt->keyEvent()->text(), evt);
 }