Create a about handler component.

Create a about handler component.
The following files ::
  chrome/browser/net/about_protocol_handler.*
  net/url_request/url_request_about_job.*
moved to new component: components/about_handler.
Also added GYP and GN file for same.

BUG=516695

Review URL: https://codereview.chromium.org/1284173003

Cr-Commit-Position: refs/heads/master@{#343366}

6 files changed, 157 insertions, 0 deletions

diff --git a/components/about_handler/BUILD.gn b/components/about_handler/BUILD.gn
new file mode 100644
index 0000000..eeaff47
--- /dev/null
+++ b/components/about_handler/BUILD.gn
@@ -0,0 +1,17 @@
+# 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.
+
+source_set("about_handler") {
+  sources = [
+    "about_protocol_handler.cc",
+    "about_protocol_handler.h",
+    "url_request_about_job.cc",
+    "url_request_about_job.h",
+  ]
+
+  deps = [
+    "//base",
+    "//net",
+  ]
+}
diff --git a/components/about_handler/DEPS b/components/about_handler/DEPS
new file mode 100644
index 0000000..8fa9d48
--- /dev/null
+++ b/components/about_handler/DEPS
@@ -0,0 +1,3 @@
+include_rules = [
+  "+net",
+]
diff --git a/components/about_handler/about_protocol_handler.cc b/components/about_handler/about_protocol_handler.cc
new file mode 100644
index 0000000..1f55f04
--- /dev/null
+++ b/components/about_handler/about_protocol_handler.cc
@@ -0,0 +1,27 @@
+// 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 "components/about_handler/about_protocol_handler.h"
+
+#include "components/about_handler/url_request_about_job.h"
+
+namespace about_handler {
+
+AboutProtocolHandler::AboutProtocolHandler() {
+}
+
+AboutProtocolHandler::~AboutProtocolHandler() {
+}
+
+net::URLRequestJob* AboutProtocolHandler::MaybeCreateJob(
+    net::URLRequest* request,
+    net::NetworkDelegate* network_delegate) const {
+  return new URLRequestAboutJob(request, network_delegate);
+}
+
+bool AboutProtocolHandler::IsSafeRedirectTarget(const GURL& location) const {
+  return false;
+}
+
+}  // namespace about_handler
diff --git a/components/about_handler/about_protocol_handler.h b/components/about_handler/about_protocol_handler.h
new file mode 100644
index 0000000..ad8adfb
--- /dev/null
+++ b/components/about_handler/about_protocol_handler.h
@@ -0,0 +1,30 @@
+// 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.
+
+#ifndef COMPONENTS_ABOUT_HANDLER_ABOUT_PROTOCOL_HANDLER_H_
+#define COMPONENTS_ABOUT_HANDLER_ABOUT_PROTOCOL_HANDLER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "net/url_request/url_request_job_factory.h"
+
+namespace about_handler {
+
+// Implements a ProtocolHandler for About jobs.
+class AboutProtocolHandler : public net::URLRequestJobFactory::ProtocolHandler {
+ public:
+  AboutProtocolHandler();
+  ~AboutProtocolHandler() override;
+  net::URLRequestJob* MaybeCreateJob(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate) const override;
+  bool IsSafeRedirectTarget(const GURL& location) const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AboutProtocolHandler);
+};
+
+}  // namespace about_handler
+
+#endif  // COMPONENTS_ABOUT_HANDLER_ABOUT_PROTOCOL_HANDLER_H_
diff --git a/components/about_handler/url_request_about_job.cc b/components/about_handler/url_request_about_job.cc
new file mode 100644
index 0000000..880685a
--- /dev/null
+++ b/components/about_handler/url_request_about_job.cc
@@ -0,0 +1,45 @@
+// 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.
+
+// Simple implementation of about: protocol handler that treats everything as
+// about:blank.  No other about: features should be available to web content,
+// so they're not implemented here.
+
+#include "components/about_handler/url_request_about_job.h"
+
+#include "base/bind.h"
+#include "base/compiler_specific.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+
+namespace about_handler {
+
+URLRequestAboutJob::URLRequestAboutJob(net::URLRequest* request,
+                                       net::NetworkDelegate* network_delegate)
+    : URLRequestJob(request, network_delegate),
+      weak_factory_(this) {
+}
+
+void URLRequestAboutJob::Start() {
+  // Start reading asynchronously so that all error reporting and data
+  // callbacks happen as they would for network requests.
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE,
+      base::Bind(&URLRequestAboutJob::StartAsync, weak_factory_.GetWeakPtr()));
+}
+
+bool URLRequestAboutJob::GetMimeType(std::string* mime_type) const {
+  *mime_type = "text/html";
+  return true;
+}
+
+URLRequestAboutJob::~URLRequestAboutJob() {
+}
+
+void URLRequestAboutJob::StartAsync() {
+  NotifyHeadersComplete();
+}
+
+}  // namespace about_handler
diff --git a/components/about_handler/url_request_about_job.h b/components/about_handler/url_request_about_job.h
new file mode 100644
index 0000000..e37c568
--- /dev/null
+++ b/components/about_handler/url_request_about_job.h
@@ -0,0 +1,35 @@
+// 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 COMPONENTS_ABOUT_HANDLER_URL_REQUEST_ABOUT_JOB_H_
+#define COMPONENTS_ABOUT_HANDLER_URL_REQUEST_ABOUT_JOB_H_
+
+#include <string>
+
+#include "base/memory/weak_ptr.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_job.h"
+
+namespace about_handler {
+
+class URLRequestAboutJob : public net::URLRequestJob {
+ public:
+  URLRequestAboutJob(net::URLRequest* request,
+                     net::NetworkDelegate* network_delegate);
+
+  // URLRequestJob:
+  void Start() override;
+  bool GetMimeType(std::string* mime_type) const override;
+
+ private:
+  ~URLRequestAboutJob() override;
+
+  void StartAsync();
+
+  base::WeakPtrFactory<URLRequestAboutJob> weak_factory_;
+};
+
+}  // namespace about_handler
+
+#endif  // COMPONENTS_ABOUT_HANDLER_URL_REQUEST_ABOUT_JOB_H_