[Icons NTP] Working prototype to fetch, store, and display big icons.

chrome/common/favicon/big_icon_url_parser.cc

+// Copyright 2015 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/common/favicon/big_icon_url_parser.h"
+
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "third_party/skia/include/utils/SkParse.h"
+#include "ui/gfx/favicon_size.h"
+
+namespace chrome {
+
+BigIconUrlParser::BigIconUrlParser() : size_in_pixels_(48) {
+}
+
+BigIconUrlParser::~BigIconUrlParser() {
+}
+
+bool BigIconUrlParser::Parse(const std::string& path) {
+  if (path.empty())
+    return false;
+
+  size_t slash = path.find("/", 0);
+  if (slash == std::string::npos)
+    return false;
+  std::string size_str = path.substr(0, slash);
+  if (!size_str.empty() && !base::StringToInt(size_str, &size_in_pixels_))
+    return false;
+
+  // Need to store the index of the URL field, so Instant Extended can translate
+  // big icon URLs using advanced parameters.
+  // Example:
+  //   "chrome-search://big-icon/48/<renderer-id>/<most-visited-id>"
+  // would be translated to:
+  //   "chrome-search://big-icon/48/<most-visited-item-with-given-id>".
+  path_index_ = slash + 1;
+  url_string_ = path.substr(path_index_);
+  return true;
+}
+
+}  // namespace chrome