Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
 #include <algorithm>
@@ skipping 408 matching lines @@
   // Use |signals_| to make sure we don't get called back after destruction.
   signals_.Connect(new_toplevel, "set-focus",
                    G_CALLBACK(&HandleWindowSetFocusThunk), this);
 }
 
 void OmniboxViewGtk::SetFocus() {
   DCHECK(text_view_);
   gtk_widget_grab_focus(text_view_);
 }
 
+void OmniboxViewGtk::ApplyCaretVisibility() {
+  // TODO(mathp): implement for Linux.
+  NOTIMPLEMENTED();
+}
+
 int OmniboxViewGtk::WidthOfTextAfterCursor() {
   // Not used.
   return -1;
 }
 
 void OmniboxViewGtk::SaveStateToTab(WebContents* tab) {
   DCHECK(tab);
   // If any text has been selected, register it as the PRIMARY selection so it
   // can still be pasted via middle-click after the text view is cleared.
   if (!selected_text_.empty())
@@ skipping 1691 matching lines @@
 void OmniboxViewGtk::AdjustVerticalAlignmentOfInstantView() {
   // By default, GtkTextView layouts an anchored child widget just above the
   // baseline, so we need to move the |instant_view_| down to make sure it
   // has the same baseline as the |text_view_|.
   PangoLayout* layout = gtk_label_get_layout(GTK_LABEL(instant_view_));
   int height;
   pango_layout_get_size(layout, NULL, &height);
   int baseline = pango_layout_get_baseline(layout);
   g_object_set(instant_anchor_tag_, "rise", baseline - height, NULL);
 }