Move instant support to SearchTabHelper. Fix InstantTab reset.

chrome/browser/ui/search/search_tab_helper.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/search/search_tab_helper.h"
 
 #include "chrome/browser/search/search.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/navigation_entry.h"
@@ skipping 15 matching lines @@
   return chrome::IsInstantNTP(contents);
 }
 
 bool IsSearchResults(const content::WebContents* contents) {
   return !chrome::GetSearchTerms(contents).empty();
 }
 
 }  // namespace
 
 SearchTabHelper::SearchTabHelper(content::WebContents* web_contents)
-    : WebContentsObserver(web_contents),
-      is_search_enabled_(chrome::IsInstantExtendedAPIEnabled()),
+    : is_search_enabled_(chrome::IsInstantExtendedAPIEnabled()),
       user_input_in_progress_(false),
       web_contents_(web_contents) {
   if (!is_search_enabled_)
     return;
 
+  WebContentsObserver::Observe(web_contents);
+
   registrar_.Add(
       this,
       content::NOTIFICATION_NAV_ENTRY_COMMITTED,
       content::Source<content::NavigationController>(
           &web_contents->GetController()));
 }
 
 SearchTabHelper::~SearchTabHelper() {
 }
 
@@ skipping 24 matching lines @@
   UpdateMode();
 }
 
 bool SearchTabHelper::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(SearchTabHelper, message)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_SearchBoxShowBars,
                         OnSearchBoxShowBars)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_SearchBoxHideBars,
                         OnSearchBoxHideBars)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_InstantSupportDetermined,
+                        OnInstantSupportDetermined);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+void SearchTabHelper::DidFinishLoad(
+    int64 /* frame_id */,
+    const GURL& /* validated_url */,
+    bool is_main_frame,
+    content::RenderViewHost* /* render_view_host */) {
+  if (is_main_frame)
+    DetermineIfPageSupportsInstant();
+}
+
 void SearchTabHelper::UpdateMode() {
   SearchMode::Type type = SearchMode::MODE_DEFAULT;
   SearchMode::Origin origin = SearchMode::ORIGIN_DEFAULT;
   if (IsNTP(web_contents_)) {
     type = SearchMode::MODE_NTP;
     origin = SearchMode::ORIGIN_NTP;
   } else if (IsSearchResults(web_contents_)) {
     type = SearchMode::MODE_SEARCH_RESULTS;
     origin = SearchMode::ORIGIN_SEARCH;
   }
   if (user_input_in_progress_)
     type = SearchMode::MODE_SEARCH_SUGGESTIONS;
   model_.SetMode(SearchMode(type, origin));
 }
 
+void SearchTabHelper::DetermineIfPageSupportsInstant() {
+  Send(new ChromeViewMsg_DetermineIfPageSupportsInstant(routing_id()));
+}
+
 void SearchTabHelper::OnSearchBoxShowBars(int page_id) {
   if (web_contents()->IsActiveEntry(page_id))
     model_.SetTopBarsVisible(true);
 }
 
 void SearchTabHelper::OnSearchBoxHideBars(int page_id) {
   if (web_contents()->IsActiveEntry(page_id)) {
     model_.SetTopBarsVisible(false);
     Send(new ChromeViewMsg_SearchBoxBarsHidden(routing_id()));
   }
 }
+
+void SearchTabHelper::OnInstantSupportDetermined(int page_id,
+                                                 bool supports_instant) {
+  if (web_contents()->IsActiveEntry(page_id))
+    model_.SetSupportsInstant(supports_instant);
+}