Persist the Instant API to committed search result pages.

chrome/browser/instant/instant_client.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_client.h"
+
+#include "chrome/browser/instant/instant_controller.h"
+#include "chrome/common/render_messages.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/web_contents.h"
+
+InstantClient::InstantClient(InstantController* controller,
+                             content::WebContents* contents)
+    : content::WebContentsObserver(contents),
+      controller_(controller),
+      supports_instant_(false) {
+}
+
+InstantClient::~InstantClient() {
+}
+
+void InstantClient::Update(const string16& user_text, bool verbatim) {
+  // TODO: Support real cursor position.
+  Send(new ChromeViewMsg_SearchBoxChange(routing_id(), user_text, verbatim,
+                                         user_text.size(), user_text.size()));
+}
+
+void InstantClient::Submit(const string16& text) {
+  Send(new ChromeViewMsg_SearchBoxSubmit(routing_id(), text));
+}
+
+void InstantClient::SendAutocompleteResults(
+    const std::vector<InstantAutocompleteResult>& results) {
+  Send(new ChromeViewMsg_SearchBoxAutocompleteResults(routing_id(), results));
+}
+
+void InstantClient::UpOrDownKeyPressed(int count) {
+  Send(new ChromeViewMsg_SearchBoxUpOrDownKeyPressed(routing_id(), count));
+}
+
+void InstantClient::DetermineIfPageSupportsInstant() {
+  Send(new ChromeViewMsg_DetermineIfPageSupportsInstant(routing_id()));
+}
+
+bool InstantClient::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(InstantClient, message)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_SetSuggestions, OnSetSuggestions)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_InstantSupportDetermined,
+                        OnInstantSupportDetermined)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void InstantClient::NotifyInstantSupportDetermined(bool supports_instant) {

[sky, 2012/11/27 01:07:51]

I would name this SetInstantSupportDetermined.

[sreeram, 2012/11/29 07:33:19]

Done. Now it's just "InstantSupportDetermined".

+  // If we already determined that the page supports Instant, nothing to do.
+  if (!supports_instant_) {
+    supports_instant_ = supports_instant;
+    controller_->InstantSupportDetermined(this, supports_instant);
+  }
+}
+
+void InstantClient::DidFinishLoad(int64 frame_id,
+                                  const GURL& validated_url,
+                                  bool is_main_frame,
+                                  content::RenderViewHost* render_view_host) {
+  if (is_main_frame && !supports_instant_)
+    DetermineIfPageSupportsInstant();
+}
+
+void InstantClient::OnSetSuggestions(
+    int page_id,
+    const std::vector<InstantSuggestion>& suggestions) {
+  content::NavigationEntry* entry =
+      contents()->GetController().GetActiveEntry();
+  if (entry && page_id == entry->GetPageID()) {
+    NotifyInstantSupportDetermined(true);
+    controller_->SetSuggestions(this, suggestions);
+  }
+}
+
+void InstantClient::OnInstantSupportDetermined(int page_id, bool result) {
+  content::NavigationEntry* entry =
+      contents()->GetController().GetActiveEntry();
+  if (entry && page_id == entry->GetPageID())
+    NotifyInstantSupportDetermined(result);
+}