Support touch icon in FaviconHelper

chrome/browser/icon_delegate.h

+// 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.
+
+#ifndef CHROME_BROWSER_ICON_DELEGATE_H__
+#define CHROME_BROWSER_ICON_DELEGATE_H__
+#pragma once
+
+#include "chrome/browser/history/history_types.h"
+
+class NavigationEntry;
+
+// IconDelegate is a interface should be implemented for a type of icon to
+// handle to update the favicon data in NavigationEntry, provide the size for a
+// type of icon or convert image to specific size.
+class IconDelegate {
+ public:
+  IconDelegate() {}
+  virtual ~IconDelegate() {}
+
+  // Updates the image data in NavigationEntry only if the image data is not
+  // valid and the given url is same as the one in NavigationEntry's favicon
+  // status.
+  virtual void UpdateFaviconImageData(NavigationEntry* entry,

[sky, 2011/03/18 17:33:37]

I was hoping a delegate interface would allow FaviconHelper not to know about
NavigationEntry, but the current code still has that. It would be nice to
totally divorce FaviconHelper from NavigationEntry, but that isn't totally
necessary.
FaviconHelper knows the icontype and can just as easily only update
NavigationEntry if type is FAVICON_TYPE. So, nuke this class and make
FaviconHelper only do parts of code if type is FAVICON_TYPE. This isn't the
cleanest thing, but what you have here doesn't help it much.

+                                      const GURL& url,
+                                      scoped_refptr<RefCountedMemory> data) = 0;
+
+  // Converts the image data to an SkBitmap and sets it on the NavigationEntry.
+  // If the TabContents has a delegate, it is notified of the new favicon
+  // (INVALIDATE_FAVICON).
+  virtual void UpdateFaviconImageData(NavigationEntry* entry,
+                                      scoped_refptr<RefCountedMemory> data);
+
+  virtual void UpdateFaviconImageData(NavigationEntry* entry,
+                                      const SkBitmap& image) = 0;
+
+  // Updates the favicon url in NavigationEntry's favicon with the given url.
+  virtual void UpdateFaviconURL(NavigationEntry* entry, const GURL& url) = 0;
+
+  // Converts downloaded icon before save to history DB and update to
+  // NavigationEntry.
+  virtual SkBitmap ConvertToFaviconSize(const SkBitmap& image) = 0;
+
+  // Returns the preferred icon size.
+  virtual int GetIconSize() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(IconDelegate);
+};
+
+#endif  // CHROME_BROWSER_ICON_DELEGATE_H__