Merge InstantPage into InstantTab.

chrome/browser/ui/search/instant_tab.cc

-// Copyright 2012 The Chromium Authors. All rights reserved.
+// Copyright 2013 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/instant_tab.h"
 
-#include "chrome/browser/ui/webui/ntp/ntp_user_data_logger.h"
+#include "chrome/browser/ui/search/search_model.h"
+#include "chrome/browser/ui/search/search_tab_helper.h"
+#include "chrome/common/url_constants.h"
+#include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 
-InstantTab::InstantTab(InstantPage::Delegate* delegate)
-    : InstantPage(delegate) {
+InstantTab::Delegate::~Delegate() {
 }
 
 InstantTab::~InstantTab() {
+  if (web_contents()) {
+    SearchTabHelper::FromWebContents(web_contents())->model()->RemoveObserver(
+        this);
+  }
 }
 
-void InstantTab::Init(content::WebContents* contents) {
-  SetContents(contents);
+bool InstantTab::supports_instant() const {
+  return web_contents() &&
+      SearchTabHelper::FromWebContents(web_contents())->SupportsInstant();
 }
 
-bool InstantTab::ShouldProcessAboutToNavigateMainFrame() {
-  return true;
+bool InstantTab::IsLocal() const {
+  return web_contents() &&
+      web_contents()->GetURL() == GURL(chrome::kChromeSearchLocalNtpUrl);
 }
+
+InstantTab::InstantTab(Delegate* delegate)
+    : delegate_(delegate) {
+}
+
+void InstantTab::Init(content::WebContents* new_web_contents) {
+  ClearContents();
+
+  if (!new_web_contents)
+    return;
+
+  Observe(new_web_contents);
+  SearchModel* model =
+      SearchTabHelper::FromWebContents(web_contents())->model();
+  model->AddObserver(this);
+
+  // Already know whether the page supports instant.
+  if (model->instant_support() != INSTANT_SUPPORT_UNKNOWN)
+    InstantSupportDetermined(model->instant_support() == INSTANT_SUPPORT_YES);
+}
+
+void InstantTab::DidCommitProvisionalLoadForFrame(
+    content::RenderFrameHost* render_frame_host,
+    const GURL& url,
+    ui::PageTransition /* transition_type */) {
+  if (!render_frame_host->GetParent()) {
+    delegate_->InstantTabAboutToNavigateMainFrame(web_contents(), url);
+  }
+}
+
+void InstantTab::ModelChanged(const SearchModel::State& old_state,
+                               const SearchModel::State& new_state) {
+  if (old_state.instant_support != new_state.instant_support)
+    InstantSupportDetermined(new_state.instant_support == INSTANT_SUPPORT_YES);
+}
+
+void InstantTab::InstantSupportDetermined(bool supports_instant) {
+  delegate_->InstantSupportDetermined(web_contents(), supports_instant);
+
+  // If the page doesn't support Instant, stop listening to it.
+  if (!supports_instant)
+    ClearContents();
+}
+
+void InstantTab::ClearContents() {
+  if (web_contents()) {
+    SearchTabHelper::FromWebContents(web_contents())->model()->RemoveObserver(
+        this);
+  }
+
+  Observe(NULL);
+}