Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/instant/instant_controller.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/instant/instant_controller.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 641 matching lines @@
 }
 
 void InstantController::ShowInstantPreview(InstantLoader* loader,
                                            InstantShownReason reason,
                                            int height,
                                            InstantSizeUnits units) {
   if (loader_ == loader && extended_enabled_)
     Show(reason, height, units);
 }
 
+void InstantController::StartCapturingKeyStrokes(InstantLoader* loader) {
+  if (loader_ == loader && extended_enabled_ && model_.mode().is_ntp())
+    browser_->SetInvisibleFocus();
+}
+
 void InstantController::InstantSupportDetermined(InstantLoader* loader,
                                                  bool supports_instant) {
   if (supports_instant) {
     blacklisted_urls_.erase(loader->instant_url());
   } else {
     ++blacklisted_urls_[loader->instant_url()];
     if (loader_ == loader)
       DeleteLoader();
   }
 
@@ skipping 217 matching lines @@
   }
 
   std::map<std::string, int>::const_iterator iter =
       blacklisted_urls_.find(*instant_url);
   if (iter != blacklisted_urls_.end() &&
       iter->second > kMaxInstantSupportFailures)
     return false;
 
   return true;
 }