Instant API: tell page whether the browser is capturing key strokes.

chrome/common/instant_types.h

Index: chrome/common/instant_types.h
diff --git a/chrome/common/instant_types.h b/chrome/common/instant_types.h
index 90a77ac44233334dd14601d60053d759bf3daea2..e562364f0dd0908a8492f74cf5ed57142c193f61 100644
--- a/chrome/common/instant_types.h
+++ b/chrome/common/instant_types.h
@@ -143,4 +143,23 @@ struct ThemeBackgroundInfo {
   uint16 image_height;
 };
 
+// Omnibox focus state as tracked by InstantController.
+enum OmniboxFocusState {
+  FOCUS_NONE,  // Not focused.
+  FOCUS_VISIBLE,  // Visibily focused.
+  FOCUS_INVISIBLE,  // Invisibly focused, i.e. focused with with a hidden caret.
+};
+
+// Reason why focus state could change.
+enum OmniboxFocusChangeReason {
+  // Includes any explicit changes to focus. (e.g. user clicking to change
+  // focus, user tabbing to change focus, any explicit calls to SetFocus etc.)
+  FOCUS_CHANGE_EXPLICIT,
+  // Focus changed to restore state from a tab the user swtched to.
+  FOCUS_CHANGE_TAB_SWITCH,
+  // Focus changed because user started typing. This only happens when focus
+  // state is INVISIBLE (and this results in a change to VISIBLE).
+  FOCUS_CHANGE_TYPING,
+};
+
 #endif  // CHROME_COMMON_INSTANT_TYPES_H_