Create CoreTabHelper, move remaining core TCW functionality into it.

chrome/browser/ui/snapshot_tab_helper.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/ui/snapshot_tab_helper.h"
+
+#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/render_messages.h"
+#include "content/public/browser/notification_service.h"
+
+SnapshotTabHelper::SnapshotTabHelper(TabContentsWrapper* wrapper)
+    : TabContentsObserver(wrapper->tab_contents()) {
+}
+
+SnapshotTabHelper::~SnapshotTabHelper() {
+}
+
+void SnapshotTabHelper::CaptureSnapshot() {
+  Send(new ChromeViewMsg_CaptureSnapshot(routing_id()));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// TabContentsObserver overrides
+
+bool SnapshotTabHelper::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(SnapshotTabHelper, message)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_Snapshot, OnSnapshot)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Internal helpers
+
+void SnapshotTabHelper::OnSnapshot(const SkBitmap& bitmap) {
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_TAB_SNAPSHOT_TAKEN,
+      content::Source<TabContentsWrapper>(wrapper_),
+      content::Details<const SkBitmap>(&bitmap));
+}