Preload Instant search when omnibox is focused.

chrome/browser/instant/instant_controller.cc

 // Copyright (c) 2011 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/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "build/build_config.h"
@@ skipping 338 matching lines @@
 
   if (view_gaining_focus_ancestor) {
     CommitCurrentPreview(INSTANT_COMMIT_FOCUS_LOST);
     return;
   }
 
   DestroyPreviewContents();
 }
 #endif
 
+void InstantController::OnAutocompleteGotFocus(
+    TabContentsWrapper* tab_contents) {
+  CommandLine* cl = CommandLine::ForCurrentProcess();
+  if (!cl->HasSwitch(switches::kPreloadInstantSearch))
+    return;
+
+  if (is_active_)
+    return;
+
+  TemplateURLModel* model = tab_contents->profile()->GetTemplateURLModel();
+  if (!model)
+    return;
+
+  const TemplateURL* template_url = model->GetDefaultSearchProvider();
+  if (!template_url)
+    return;
+
+  if (tab_contents != tab_contents_)
+    DestroyPreviewContents();
+  tab_contents_ = tab_contents;
+
+  if (!loader_manager_.get())
+    loader_manager_.reset(new InstantLoaderManager(this));
+  loader_manager_->GetInstantLoader(template_url->id())
+                 ->MaybeLoadInstantURL(tab_contents, template_url);
+}
+
 TabContentsWrapper* InstantController::ReleasePreviewContents(
     InstantCommitType type) {
   if (!loader_manager_.get())
     return NULL;
 
   // Make sure the pending loader is active. Ideally we would call
   // ShowTimerFired, but if Release is invoked from the browser we don't want to
   // attempt to show the tab contents (since its being added to a new tab).
   if (type == INSTANT_COMMIT_PRESSED_ENTER && show_timer_.IsRunning()) {
     InstantLoader* loader = loader_manager_->active_loader();
@@ skipping 330 matching lines @@
     const AutocompleteMatch& match) {
   const TemplateURL* template_url = match.template_url;
   if (match.type == AutocompleteMatch::SEARCH_WHAT_YOU_TYPED ||
       match.type == AutocompleteMatch::SEARCH_HISTORY ||
       match.type == AutocompleteMatch::SEARCH_SUGGEST) {
     TemplateURLModel* model = tab_contents_->profile()->GetTemplateURLModel();
     template_url = model ? model->GetDefaultSearchProvider() : NULL;
   }
   return template_url;
 }