Get mojo_shell building inside chromium checkout.

mojo/shell/application_manager/fetcher.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 "mojo/shell/application_manager/fetcher.h"
+
+#include "url/gurl.h"
+
+namespace mojo {
+namespace shell {
+
+const char Fetcher::kMojoMagic[] = "#!mojo ";
+const size_t Fetcher::kMaxShebangLength = 2048;
+
+Fetcher::Fetcher(const FetchCallback& loader_callback)
+    : loader_callback_(loader_callback) {
+}
+
+Fetcher::~Fetcher() {
+}
+
+bool Fetcher::PeekContentHandler(std::string* mojo_shebang,
+                                 GURL* mojo_content_handler_url) {
+  // TODO(aa): I guess this should just go in ApplicationManager now.
+  std::string shebang;
+  if (HasMojoMagic() && PeekFirstLine(&shebang)) {
+    GURL url(shebang.substr(arraysize(kMojoMagic) - 1, std::string::npos));
+    if (url.is_valid()) {
+      *mojo_shebang = shebang;
+      *mojo_content_handler_url = url;
+      return true;
+    }
+  }
+  return false;
+}
+
+}  // namespace shell
+}  // namespace mojo