Extract Favicon Download logic from FaviconTabHelper

chrome/browser/favicon/favicon_download_helper.cc

+// Copyright (c) 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/favicon/favicon_download_helper.h"
+
+#include "chrome/browser/favicon/favicon_download_helper_delegate.h"
+#include "chrome/browser/favicon/favicon_util.h"
+#include "chrome/common/icon_messages.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_delegate.h"
+
+using content::WebContents;
+
+FaviconDownloadHelper::FaviconDownloadHelper(
+    WebContents* web_contents,
+    FaviconDownloadHelperDelegate* delegate)
+    : content::WebContentsObserver(web_contents),
+      delegate_(delegate) {
+  DCHECK(delegate_);
+}
+
+FaviconDownloadHelper::~FaviconDownloadHelper() {
+}
+
+int FaviconDownloadHelper::DownloadFavicon(const GURL& url, int image_size) {
+  content::RenderViewHost* host = web_contents()->GetRenderViewHost();
+  int id = FaviconUtil::DownloadFavicon(host, url, image_size);
+  DownloadIdList::iterator i =
+      std::find(download_ids_.begin(), download_ids_.end(), id);
+  DCHECK(i == download_ids_.end());
+  download_ids_.insert(id);
+  return id;
+}
+
+bool FaviconDownloadHelper::OnMessageReceived(const IPC::Message& message) {
+  bool message_handled = false;   // Allow other handlers to receive these.
+  IPC_BEGIN_MESSAGE_MAP(FaviconDownloadHelper, message)
+    IPC_MESSAGE_HANDLER(IconHostMsg_DidDownloadFavicon, OnDidDownloadFavicon)
+    IPC_MESSAGE_HANDLER(IconHostMsg_UpdateFaviconURL, OnUpdateFaviconURL)
+    IPC_MESSAGE_UNHANDLED(message_handled = false)
+  IPC_END_MESSAGE_MAP()
+  return message_handled;
+}
+
+void FaviconDownloadHelper::OnDidDownloadFavicon(
+    int id,
+    const GURL& image_url,
+    bool errored,
+    int requested_size,
+    const std::vector<SkBitmap>& bitmaps) {
+  DownloadIdList::iterator i =
+    std::find(download_ids_.begin(), download_ids_.end(), id);

[sky, 2012/10/30 21:39:09]

nit: indent 4.

[Cait (Slow), 2012/10/31 19:26:32]

Done.

+  if (i == download_ids_.end()) {
+    // Currently WebContents notifies us of ANY downloads so that it is
+    // possible to get here.
+    return;
+  }
+  delegate_->OnDidDownloadFavicon(
+      id, image_url, errored, requested_size, bitmaps);
+  download_ids_.erase(i);
+}
+
+void FaviconDownloadHelper::OnUpdateFaviconURL(
+    int32 page_id,
+    const std::vector<FaviconURL>& candidates) {
+  delegate_->OnUpdateFaviconURL(page_id, candidates);
+}