Prevent the screen from sleeping when the desktop is being captured.

content/browser/media/capture/desktop_capture_device.cc

 // Copyright (c) 2013 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 "content/browser/media/capture/desktop_capture_device.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread.h"
 #include "base/timer/timer.h"
 #include "content/browser/media/capture/desktop_capture_device_uma_types.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/desktop_media_id.h"
+#include "content/public/browser/power_save_blocker.h"
 #include "media/base/video_util.h"
 #include "third_party/libyuv/include/libyuv/scale_argb.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_and_cursor_composer.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_capture_options.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 #include "third_party/webrtc/modules/desktop_capture/mouse_cursor_monitor.h"
 #include "third_party/webrtc/modules/desktop_capture/screen_capturer.h"
 #include "third_party/webrtc/modules/desktop_capture/window_capturer.h"
 
@@ skipping 89 matching lines @@
 
   // True if the first capture call has returned. Used to log the first capture
   // result.
   bool first_capture_returned_;
 
   // The type of the capturer.
   DesktopMediaID::Type capturer_type_;
 
   scoped_ptr<webrtc::BasicDesktopFrame> black_frame_;
 
+  // TODO(jiayl): Remove power_save_blocker_ when there is an API to keep the
+  // screen from sleeping for the drive-by web.
+  scoped_ptr<PowerSaveBlocker> power_save_blocker_;
+
   DISALLOW_COPY_AND_ASSIGN(Core);
 };
 
 DesktopCaptureDevice::Core::Core(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     scoped_ptr<webrtc::DesktopCapturer> capturer,
     DesktopMediaID::Type type)
     : task_runner_(task_runner),
       desktop_capturer_(capturer.Pass()),
       capture_in_progress_(false),
@@ skipping 20 matching lines @@
   DCHECK(!client_.get());
 
   client_ = client.Pass();
   requested_params_ = params;
 
   capture_format_ = requested_params_.requested_format;
 
   // This capturer always outputs ARGB, non-interlaced.
   capture_format_.pixel_format = media::PIXEL_FORMAT_ARGB;
 
+  power_save_blocker_.reset(PowerSaveBlocker::Create(
+      PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
+      "DesktopCaptureDevice is running").release());
+
   desktop_capturer_->Start(this);
 
   CaptureFrameAndScheduleNext();
 }
 
 void DesktopCaptureDevice::Core::SetNotificationWindowId(
     gfx::NativeViewId window_id) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK(window_id);
   desktop_capturer_->SetExcludedWindow(window_id);
@@ skipping 287 matching lines @@
 #else
   base::MessageLoop::Type thread_type = base::MessageLoop::TYPE_DEFAULT;
 #endif
 
   thread_.StartWithOptions(base::Thread::Options(thread_type, 0));
 
   core_.reset(new Core(thread_.message_loop_proxy(), capturer.Pass(), type));
 }
 
 }  // namespace content