Add text offset to OnSurroundingTextChanged

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index 4ae5f1acbc167a1f0a5d38ddf55cdc471cec525a..e67c8c4ae05172a41e8d1fb7215a94b7c86d1336 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -1558,6 +1558,10 @@ bool Textfield::SetSelectionRange(const gfx::Range& range) {
   return true;
 }
 
+uint32 Textfield::GetSelectionOffset() const {
+  return 0;

[Shu Chen, 2015/08/12 07:23:16]

Why always return 0?

[rsadam, 2015/08/12 21:46:52]

From my understanding textfield.h is for all native textboxes e.g omnibox. These
return the complete surrounding text, and so the offset is always 0. We could
change textfield.h behaviour to mimic blink, and only return the last 100
characters.

[Shu Chen, 2015/08/13 01:27:24]

Let's not change the existing behavior for now.
Returning zero here sounds fine.

+}
+
 bool Textfield::DeleteRange(const gfx::Range& range) {
   if (!ImeEditingAllowed() || range.is_empty())
     return false;