From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: deepak1556 <hop2deep@gmail.com>
Date: Thu, 18 Oct 2018 17:07:01 -0700
Subject: desktop_media_list.patch

* Expose the capturer source list for the desktopCapturer API
* Free the one-time use capturer after thumbnails are fetched

diff --git a/chrome/browser/media/webrtc/desktop_media_list.h b/chrome/browser/media/webrtc/desktop_media_list.h
index a489bf6ea2179059f53e53563e993db9c7cd123b..93e237569fe94ec8526f67d915e1a7352d586b16 100644
--- a/chrome/browser/media/webrtc/desktop_media_list.h
+++ b/chrome/browser/media/webrtc/desktop_media_list.h
@@ -38,6 +38,9 @@ class DesktopMediaList {
 
   virtual ~DesktopMediaList() {}
 
+  // Allows listening to notifications generated by the model.
+  virtual void AddObserver(DesktopMediaListObserver* observer) = 0;
+
   // Sets time interval between updates. By default list of sources and their
   // thumbnail are updated once per second. If called after StartUpdating() then
   // it will take effect only after the next update.
@@ -69,6 +72,7 @@ class DesktopMediaList {
 
   virtual int GetSourceCount() const = 0;
   virtual const Source& GetSource(int index) const = 0;
+  virtual const std::vector<Source>& GetSources() const = 0;
 
   virtual content::DesktopMediaID::Type GetMediaListType() const = 0;
 };
diff --git a/chrome/browser/media/webrtc/desktop_media_list_base.cc b/chrome/browser/media/webrtc/desktop_media_list_base.cc
index 147d5be9f7f56fb71468b56e86eb33b59d51cd66..5930fe95e33a9e5a3108c31e8c34daa9c724511c 100644
--- a/chrome/browser/media/webrtc/desktop_media_list_base.cc
+++ b/chrome/browser/media/webrtc/desktop_media_list_base.cc
@@ -20,6 +20,11 @@ DesktopMediaListBase::DesktopMediaListBase(base::TimeDelta update_period)
 
 DesktopMediaListBase::~DesktopMediaListBase() {}
 
+void DesktopMediaListBase::AddObserver(DesktopMediaListObserver* observer) {
+  DCHECK(!observer_);
+  observer_ = observer;
+}
+
 void DesktopMediaListBase::SetUpdatePeriod(base::TimeDelta period) {
   DCHECK(!observer_);
   update_period_ = period;
@@ -54,7 +59,7 @@ void DesktopMediaListBase::Update(UpdateCallback callback) {
   DCHECK(sources_.empty());
   DCHECK(!refresh_callback_);
   refresh_callback_ = std::move(callback);
-  Refresh(false);
+  Refresh(true);
 }
 
 int DesktopMediaListBase::GetSourceCount() const {
@@ -68,6 +73,11 @@ const DesktopMediaList::Source& DesktopMediaListBase::GetSource(
   return sources_[index];
 }
 
+const std::vector<DesktopMediaList::Source>& DesktopMediaListBase::GetSources()
+    const {
+  return sources_;
+}
+
 DesktopMediaID::Type DesktopMediaListBase::GetMediaListType() const {
   return type_;
 }
@@ -79,6 +89,12 @@ DesktopMediaListBase::SourceDescription::SourceDescription(
 
 void DesktopMediaListBase::UpdateSourcesList(
     const std::vector<SourceDescription>& new_sources) {
+  // Notify observer when there was no new source captured.
+  if (new_sources.empty()) {
+    observer_->OnSourceUnchanged(this);
+    return;
+  }
+
   typedef std::set<DesktopMediaID> SourceSet;
   SourceSet new_source_set;
   for (size_t i = 0; i < new_sources.size(); ++i) {
diff --git a/chrome/browser/media/webrtc/desktop_media_list_base.h b/chrome/browser/media/webrtc/desktop_media_list_base.h
index 3c09ec3111d54cb4f0b74f16a81292b779009eae..5c3667822afd47a22878b508b844a615c24f3162 100644
--- a/chrome/browser/media/webrtc/desktop_media_list_base.h
+++ b/chrome/browser/media/webrtc/desktop_media_list_base.h
@@ -27,6 +27,7 @@ class DesktopMediaListBase : public DesktopMediaList {
   ~DesktopMediaListBase() override;
 
   // DesktopMediaList interface.
+  void AddObserver(DesktopMediaListObserver* observer) override;
   void SetUpdatePeriod(base::TimeDelta period) override;
   void SetThumbnailSize(const gfx::Size& thumbnail_size) override;
   void SetViewDialogWindowId(content::DesktopMediaID dialog_id) override;
@@ -34,6 +35,7 @@ class DesktopMediaListBase : public DesktopMediaList {
   void Update(UpdateCallback callback) override;
   int GetSourceCount() const override;
   const Source& GetSource(int index) const override;
+  const std::vector<Source>& GetSources() const override;
   content::DesktopMediaID::Type GetMediaListType() const override;
 
   static uint32_t GetImageHash(const gfx::Image& image);
diff --git a/chrome/browser/media/webrtc/desktop_media_list_observer.h b/chrome/browser/media/webrtc/desktop_media_list_observer.h
index ad7f766a36b1b6b2a8bc0f96369f1aaadf6681f7..f6c6c14a0937430df62c9b9c1132c5916a9f2009 100644
--- a/chrome/browser/media/webrtc/desktop_media_list_observer.h
+++ b/chrome/browser/media/webrtc/desktop_media_list_observer.h
@@ -20,6 +20,7 @@ class DesktopMediaListObserver {
                              int new_index) = 0;
   virtual void OnSourceNameChanged(DesktopMediaList* list, int index) = 0;
   virtual void OnSourceThumbnailChanged(DesktopMediaList* list, int index) = 0;
+  virtual void OnSourceUnchanged(DesktopMediaList* list) = 0;
 
  protected:
   virtual ~DesktopMediaListObserver() {}
diff --git a/chrome/browser/media/webrtc/native_desktop_media_list.cc b/chrome/browser/media/webrtc/native_desktop_media_list.cc
index e08e556858e4079d953027399e04056f62e2db78..2aa72571e44a9027d5bd84498d65f835da87935b 100644
--- a/chrome/browser/media/webrtc/native_desktop_media_list.cc
+++ b/chrome/browser/media/webrtc/native_desktop_media_list.cc
@@ -10,13 +10,14 @@
 #include "base/hash/hash.h"
 #include "base/message_loop/message_pump_type.h"
 #include "base/single_thread_task_runner.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/browser/media/webrtc/desktop_media_list.h"
-#include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_task_traits.h"
 #include "content/public/browser/browser_thread.h"
+#include "electron/grit/electron_resources.h"
 #include "media/base/video_util.h"
 #include "third_party/libyuv/include/libyuv/scale_argb.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ -223,6 +224,8 @@ void NativeDesktopMediaList::Worker::RefreshThumbnails(
       FROM_HERE,
       base::BindOnce(&NativeDesktopMediaList::UpdateNativeThumbnailsFinished,
                      media_list_));
+
+  capturer_.reset();
 }
 
 bool NativeDesktopMediaList::Worker::IsCurrentFrameValid() const {
