Implement screen capture for android

chrome/browser/media/media_capture_devices_dispatcher.cc

 // 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 "chrome/browser/media/media_capture_devices_dispatcher.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/prefs/pref_service.h"
@@ skipping 566 matching lines @@
           application_name);
       chrome::MessageBoxResult result = chrome::ShowMessageBox(
           parent_window,
           l10n_util::GetStringFUTF16(
               IDS_MEDIA_SCREEN_CAPTURE_CONFIRMATION_TITLE, application_name),
           confirmation_text,
           chrome::MESSAGE_BOX_TYPE_QUESTION);
       user_approved = (result == chrome::MESSAGE_BOX_RESULT_YES);
     }
 
+#if defined(OS_ANDROID)
+    // For android, MediaProjectionManager API will start an activity to
+    // prompt the user whether to allow screen capture. So here user_approved
+    // is useless.
+    user_approved = true;
+#endif
     if (user_approved || component_extension || whitelisted_extension) {
       content::DesktopMediaID screen_id;
 #if defined(OS_CHROMEOS)
       screen_id = content::DesktopMediaID::RegisterAuraWindow(
           ash::Shell::GetInstance()->GetPrimaryRootWindow());
 #else  // defined(OS_CHROMEOS)
       screen_id =
           content::DesktopMediaID(content::DesktopMediaID::TYPE_SCREEN,
                                   webrtc::kFullDesktopScreenId);
 #endif  // !defined(OS_CHROMEOS)
@@ skipping 470 matching lines @@
 
 void MediaCaptureDevicesDispatcher::SetTestAudioCaptureDevices(
     const MediaStreamDevices& devices) {
   test_audio_devices_ = devices;
 }
 
 void MediaCaptureDevicesDispatcher::SetTestVideoCaptureDevices(
     const MediaStreamDevices& devices) {
   test_video_devices_ = devices;
 }