Add icon fetching sources

chromium_src/chrome/browser/icon_loader.cc

@@ -0,0 +1,49 @@
+// 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/icon_loader.h"
+
+#include "base/bind.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "content/public/browser/browser_thread.h"
+
+using content::BrowserThread;
+
+IconLoader::IconLoader(const base::FilePath& file_path,
+                       IconSize size,
+                       Delegate* delegate)
+    : target_task_runner_(NULL),
+      file_path_(file_path),
+      icon_size_(size),
+      delegate_(delegate) {}
+
+IconLoader::~IconLoader() {
+}
+
+void IconLoader::Start() {
+  target_task_runner_ = base::ThreadTaskRunnerHandle::Get();
+
+  BrowserThread::PostTaskAndReply(BrowserThread::FILE, FROM_HERE,
+      base::Bind(&IconLoader::ReadGroup, this),
+      base::Bind(&IconLoader::OnReadGroup, this));
+}
+
+void IconLoader::ReadGroup() {
+  group_ = ReadGroupIDFromFilepath(file_path_);
+}
+
+void IconLoader::OnReadGroup() {
+  if (IsIconMutableFromFilepath(file_path_) ||
+      !delegate_->OnGroupLoaded(this, group_)) {
+    BrowserThread::PostTask(ReadIconThreadID(), FROM_HERE,
+        base::Bind(&IconLoader::ReadIcon, this));
+  }
+}
+
+void IconLoader::NotifyDelegate() {
+  // If the delegate takes ownership of the Image, release it from the scoped
+  // pointer.
+  if (delegate_->OnImageLoaded(this, image_.get(), group_))
+    ignore_result(image_.release());  // Can't ignore return value.
+}