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..238c70368df96ba1310747b2bfb0e2e6e385684c 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 offset. Since only a subset of surrounding
+  // text is cached, this value indicates the offset of the stored text relative
+  // to the entire text body.
+  virtual uint32 GetTextOffset() const = 0;

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

What's the difference between GetTextRange and GetTextOffset?

[rsadam, 2015/08/13 04:31:11]

Oh wow, nice catch. They're identical. This simplifies this CL significantly.

+
   // 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.