Make Google Search autocomplete provider cursor aware.

chrome/browser/ui/omnibox/omnibox_edit_model.h

Index: chrome/browser/ui/omnibox/omnibox_edit_model.h
diff --git a/chrome/browser/ui/omnibox/omnibox_edit_model.h b/chrome/browser/ui/omnibox/omnibox_edit_model.h
index 6caf62f542932a94b4d3cbe564454c88cc6574c4..b7deb39bec18d36cc44c21e16ead5b084b7632dc 100644
--- a/chrome/browser/ui/omnibox/omnibox_edit_model.h
+++ b/chrome/browser/ui/omnibox/omnibox_edit_model.h
@@ -418,6 +418,10 @@ class OmniboxEditModel : public AutocompleteControllerDelegate {
   // autocomplete text that has not yet been accepted.
   string16 user_text_;
 
+  // The 0-based position of the cursor within |user_text_| or string16::npos
+  // if unknown or past the last character.
+  size_t cursor_position_;

[Peter Kasting, 2012/12/05 20:49:38]

I don't think we need to track this as a member (or should).  We should just
fetch the cursor position dynamically when needed, e.g. by calling
OmniboxView::GetSelectionBounds() and using the |end| value it returns.

[Bart N., 2012/12/06 21:43:32]

Great suggestion, thanks! I wonder why it is end rather than start?

[Peter Kasting, 2012/12/06 22:16:35]

Well, think about how you create a selection (with keys or mouse), and then if
you hit an arrow key after that, where you'd expect the cursor to have moved
from.

+
   // We keep track of when the user began modifying the omnibox text.
   // This should be valid whenever user_input_in_progress_ is true.
   base::TimeTicks time_user_first_modified_omnibox_;