feat: make desktopCapturer main-process-only (#30720)

* feat: make desktopCapturer main-process-only

* remove --enable-api-filtering-logging

* remove test

* merge lib/browser/api/desktop-capturer.ts with lib/browser/desktop-capturer.ts

* remove desktop-capturer-get-sources event

* fix specs

* getSources needs to be async

Co-authored-by: Milan Burda <milan.burda@gmail.com>

docs/api/app.md

@@ -500,16 +500,6 @@ gets emitted.
 **Note:** Extra command line arguments might be added by Chromium,
 such as `--original-process-start-time`.
 
-### Event: 'desktop-capturer-get-sources'
-
-Returns:
-
-* `event` Event
-* `webContents` [WebContents](web-contents.md)
-
-Emitted when `desktopCapturer.getSources()` is called in the renderer process of `webContents`.
-Calling `event.preventDefault()` will make it return empty sources.
-
 ## Methods
 
 The `app` object has the following methods:

docs/api/command-line-switches.md

@@ -61,12 +61,6 @@ throttling in one window, you can take the hack of
 
 Forces the maximum disk space to be used by the disk cache, in bytes.
 
-### --enable-api-filtering-logging
-
-Enables caller stack logging for the following APIs (filtering events):
-
-* `desktopCapturer.getSources()` / `desktop-capturer-get-sources`
-
 ### --enable-logging[=file]
 
 Prints Chromium's logging to stderr (or a log file).

docs/api/desktop-capturer.md

@@ -3,40 +3,49 @@
 > Access information about media sources that can be used to capture audio and
 > video from the desktop using the [`navigator.mediaDevices.getUserMedia`] API.
 
-Process: [Main](../glossary.md#main-process), [Renderer](../glossary.md#renderer-process)
+Process: [Main](../glossary.md#main-process)
 
 The following example shows how to capture video from a desktop window whose
 title is `Electron`:
 
 ```javascript
-// In the renderer process.
+// In the main process.
 const { desktopCapturer } = require('electron')
 
 desktopCapturer.getSources({ types: ['window', 'screen'] }).then(async sources => {
   for (const source of sources) {
     if (source.name === 'Electron') {
-      try {
-        const stream = await navigator.mediaDevices.getUserMedia({
-          audio: false,
-          video: {
-            mandatory: {
-              chromeMediaSource: 'desktop',
-              chromeMediaSourceId: source.id,
-              minWidth: 1280,
-              maxWidth: 1280,
-              minHeight: 720,
-              maxHeight: 720
-            }
-          }
-        })
-        handleStream(stream)
-      } catch (e) {
-        handleError(e)
-      }
+      mainWindow.webContents.send('SET_SOURCE', source.id)
       return
     }
   }
 })
+```
+
+```javascript
+// In the preload script.
+const { ipcRenderer } = require('electron')
+
+ipcRenderer.on('SET_SOURCE', async (event, sourceId) => {
+  try {
+    const stream = await navigator.mediaDevices.getUserMedia({
+      audio: false,
+      video: {
+        mandatory: {
+          chromeMediaSource: 'desktop',
+          chromeMediaSourceId: sourceId,
+          minWidth: 1280,
+          maxWidth: 1280,
+          minHeight: 720,
+          maxHeight: 720
+        }
+      }
+    })
+    handleStream(stream)
+  } catch (e) {
+    handleError(e)
+  }
+})
 
 function handleStream (stream) {
   const video = document.querySelector('video')

docs/api/web-contents.md

@@ -856,15 +856,6 @@ Returns:
 
 Emitted when the renderer process sends a synchronous message via `ipcRenderer.sendSync()`.
 
-#### Event: 'desktop-capturer-get-sources'
-
-Returns:
-
-* `event` Event
-
-Emitted when `desktopCapturer.getSources()` is called in the renderer process.
-Calling `event.preventDefault()` will make it return empty sources.
-
 #### Event: 'preferred-size-changed'
 
 Returns: