Add text offset to OnSurroundingTextChanged

ui/base/ime/text_input_client.h

Index: ui/base/ime/text_input_client.h
diff --git a/ui/base/ime/text_input_client.h b/ui/base/ime/text_input_client.h
index aea24b2984920f5e191e7dfd6a44efdc703fff0f..d60c8def60defbd85552558773cdb10fa8048de4 100644
--- a/ui/base/ime/text_input_client.h
+++ b/ui/base/ime/text_input_client.h
@@ -99,7 +99,7 @@ class UI_BASE_IME_EXPORT TextInputClient {
 
   // Document content operations ----------------------------------------------
 
-  // Retrieves the UTF-16 based character range containing accessibled text in
+  // Retrieves the UTF-16 based character range containing accessible text in
   // the View. It must cover the composition and selection range.
   // Returns false if the information cannot be retrieved right now.
   virtual bool GetTextRange(gfx::Range* range) const = 0;
@@ -117,6 +117,11 @@ class UI_BASE_IME_EXPORT TextInputClient {
   // Returns false if the operation is not supported.
   virtual bool SetSelectionRange(const gfx::Range& range) = 0;
 
+  // Retrieves the text selection offset. Since only a subset of surrounding
+  // text is cached, this value indicates the offset of the selection relative
+  // to the entire text body.
+  virtual uint32 GetSelectionOffset() const = 0;

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

What's the difference between "GetSelectionRange(&range); range.start();" and
"GetSelectionOffset()"?

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

Renamed it to GetTextOffset and updated the comment.

+
   // Deletes contents in the given UTF-16 based character range. Current
   // composition text will be confirmed before deleting the range.
   // The input caret will be moved to the place where the range gets deleted.