Add android download controller.

content/browser/android/download_controller.h

+// 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.
+
+// This class pairs with DownloadController on Java side to forward requests
+// for GET downloads to the current DownloadListener. POST downloads are
+// handled on the native side.
+//
+// Both classes are Singleton classes. C++ object owns Java object.
+//
+// Call sequence
+// GET downloads:
+// DownloadController::NewGetDownload() =>
+// DownloadController.newHttpGetDownload() =>
+// DownloadListener.onDownloadStart() /
+// DownloadListener2.requestHttpGetDownload()
+//
+
+#ifndef CONTENT_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_H_
+#define CONTENT_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_H_
+#pragma once
+
+#include <string>
+
+#include "base/android/jni_helper.h"
+#include "base/memory/singleton.h"
+#include "content/public/browser/download_item.h"
+#include "googleurl/src/gurl.h"
+
+namespace net {
+class URLRequest;
+}
+
+namespace content {
+struct GlobalRequestID;
+class RenderViewHost;
+class WebContents;
+
+class DownloadController : public content::DownloadItem::Observer {
+ public:
+  static bool RegisterDownloadController(JNIEnv* env);
+  static DownloadController* GetInstance();
+
+  // Called when DownloadController Java object is instantiated.
+  void Init(JNIEnv* env, jobject obj);
+
+  // Starts a new download request with Android. Should be called on the
+  // UI thread.
+  void NewGetDownload(content::RenderViewHost* source,
+                      int request_id);
+
+  // Should be called when a POST download is started. Notifies the embedding
+  // app about the download. Called on the UI thread.
+  void OnPostDownloadStarted(content::WebContents* web_contents,
+                             content::DownloadItem* download_item);
+
+  // DownloadItem::Observer interface.
+  virtual void OnDownloadUpdated(content::DownloadItem* item) OVERRIDE;
+  virtual void OnDownloadOpened(content::DownloadItem* item) OVERRIDE;
+
+ private:
+  // Used to store all the information about an Android download.
+  struct DownloadInfoAndroid {
+    explicit DownloadInfoAndroid(net::URLRequest* request);
+    ~DownloadInfoAndroid() {}
+
+    // The URL from which we are downloading. This is the final URL after any
+    // redirection by the server for |original_url_|.
+    GURL url;
+    // The original URL before any redirection by the server for this URL.
+    GURL original_url;
+    int64 total_bytes;
+    std::string content_disposition;
+    std::string original_mime_type;
+
+    std::string user_agent;
+    std::string cookie;
+
+    content::WebContents* web_contents;
+    // Default copy constructor is used for passing this struct by value.
+  };
+
+  struct JavaObject;
+  friend struct DefaultSingletonTraits<DownloadController>;
+  DownloadController();
+  virtual ~DownloadController();
+
+  void PrepareDownloadInfo(const content::GlobalRequestID& global_id,
+                           int render_process_id,
+                           int render_view_id);
+
+  void OnCookieResponse(DownloadInfoAndroid info,
+                        int render_process_id,
+                        int render_view_id,
+                        const std::string& cookie);
+
+  void StartAndroidDownload(const DownloadInfoAndroid& info,
+                            int render_process_id,
+                            int render_view_id);
+
+  jobject GetContentViewFromWebContents(content::WebContents* web_contents);
+  jobject GetContentView(int render_process_id, int render_view_id);
+
+  // Creates Java object if it is not created already and returns it.
+  JavaObject* java_object();
+
+  JavaObject* java_object_;
+
+  DISALLOW_COPY_AND_ASSIGN(DownloadController);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_H_