Revert of Move fetching logic out of ApplicationManager, eliminate url mappings.

mojo/runner/about_fetcher.cc

Index: mojo/runner/about_fetcher.cc
diff --git a/mojo/runner/about_fetcher.cc b/mojo/runner/about_fetcher.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e521b80b019c390190e6dc02094bc0262da6f1cd
--- /dev/null
+++ b/mojo/runner/about_fetcher.cc
@@ -0,0 +1,111 @@
+// 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/runner/about_fetcher.h"
+
+#include "base/bind.h"
+#include "base/files/file_path.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+
+namespace mojo {
+namespace runner {
+namespace {
+
+void RunFetcherCallback(const shell::Fetcher::FetchCallback& callback,
+                        scoped_ptr<shell::Fetcher> fetcher,
+                        bool success) {
+  callback.Run(success ? fetcher.Pass() : nullptr);
+}
+
+}  // namespace
+
+const char AboutFetcher::kAboutScheme[] = "about";
+const char AboutFetcher::kAboutBlankURL[] = "about:blank";
+
+// static
+void AboutFetcher::Start(const GURL& url,
+                         const FetchCallback& loader_callback) {
+  // The object manages its own lifespan.
+  new AboutFetcher(url, loader_callback);
+}
+
+AboutFetcher::AboutFetcher(const GURL& url,
+                           const FetchCallback& loader_callback)
+    : Fetcher(loader_callback), url_(url) {
+  BuildResponse();
+}
+
+AboutFetcher::~AboutFetcher() {}
+
+void AboutFetcher::BuildResponse() {
+  if (url_ != GURL(kAboutBlankURL)) {
+    PostToRunCallback(false);
+    return;
+  }
+
+  response_ = URLResponse::New();
+  response_->url = kAboutBlankURL;
+  response_->status_code = 200;
+  response_->mime_type = "text/html";
+  PostToRunCallback(true);
+}
+
+void AboutFetcher::PostToRunCallback(bool success) {
+  // Also pass |this| on failure, so that we won't destroy the object while the
+  // constructor is still on the call stack.
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(RunFetcherCallback, loader_callback_,
+                 base::Passed(make_scoped_ptr<Fetcher>(this)), success));
+}
+
+const GURL& AboutFetcher::GetURL() const {
+  return url_;
+}
+
+GURL AboutFetcher::GetRedirectURL() const {
+  return GURL::EmptyGURL();
+}
+
+GURL AboutFetcher::GetRedirectReferer() const {
+  return GURL::EmptyGURL();
+}
+
+URLResponsePtr AboutFetcher::AsURLResponse(base::TaskRunner* task_runner,
+                                           uint32_t skip) {
+  DCHECK(response_);
+
+  // Ignore |skip| because the only URL handled currently is "about:blank" which
+  // doesn't have a body.
+  DCHECK(!response_->body.is_valid());
+
+  return response_.Pass();
+}
+
+void AboutFetcher::AsPath(
+    base::TaskRunner* task_runner,
+    base::Callback<void(const base::FilePath&, bool)> callback) {
+  NOTIMPLEMENTED();
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE, base::Bind(callback, base::FilePath(), false));
+}
+
+std::string AboutFetcher::MimeType() {
+  DCHECK(response_);
+  return response_->mime_type;
+}
+
+bool AboutFetcher::HasMojoMagic() {
+  return false;
+}
+
+bool AboutFetcher::PeekFirstLine(std::string* line) {
+  // The only URL handled currently is "about:blank" which doesn't have a body.
+  return false;
+}
+
+}  // namespace runner
+}  // namespace mojo