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

chrome/browser/ui/views/omnibox/omnibox_view_win.cc

Index: chrome/browser/ui/views/omnibox/omnibox_view_win.cc
diff --git a/chrome/browser/ui/views/omnibox/omnibox_view_win.cc b/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
index e42310b09283f19a2744e6dd3e23c1cff9a6af79..4918cf082b5a73949e26884545513572a5b262bc 100644
--- a/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
+++ b/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
@@ -761,10 +761,11 @@ void OmniboxViewWin::UpdatePopup() {
 
 void OmniboxViewWin::SetFocus() {
   ::SetFocus(m_hWnd);
-  // Restore caret visibility if focused explicitly. We need to do this here
-  // because if we already have invisible focus, the ::SetFocus call above will
-  // short-circuit, preventing us from reaching OmniboxEditModel::OnSetFocus(),
-  // which handles restoring visibility when we didn't previously have focus.
+  // Restore caret visibility if focus is explicitly requested. This is
+  // necessary because if we already have invisible focus, the ::SetFocus()
+  // call above will short-circuit, preventing us from reaching
+  // OmniboxEditModel::OnSetFocus(), which handles restoring visibility when the
+  // omnibox regains focus after losing focus.
   model()->SetCaretVisibility(true);
 }
 
@@ -1783,8 +1784,10 @@ LRESULT OmniboxViewWin::OnMouseActivate(HWND window,
     }
     gaining_focus_.reset(new ScopedFreeze(this, GetTextObjectModel()));
 
-    // Explicitely set focus visibility in the case of clicking on the omnibox,
-    // which will remove invisible focus if present.
+    // Restore caret visibility whenever the user clicks in the omnibox in a
+    // way that would give it focus.  We must handle this case separately here
+    // because if the omnibox currently has invisible focus, the mouse event
+    // won't trigger either SetFocus() or OmniboxEditModel::OnSetFocus().
     model()->SetCaretVisibility(true);
 
     // NOTE: Despite |mouse_message| being WM_XBUTTONDOWN here, we're not