Bug 1827583 - Set event listener to current media control after switching process. r=geckoview-reviewers,amejiamarmol,jonalmeida

This issue is a timing issue of loading content via about:config etc.

Although `GeckoViewMediaControl` registers event listeners for
`MediaController` when enabling `MediaSessionDelegate`, if process
switching occurs, `browsingContenxt` and `MediaController` are re-created.

It means that we has to register newer `MediaController`.

To detect destroying current browser, I will add `onDestroyBrowser` to
`GeckoViewModule` again (This was removed by bug 1672262).

Differential Revision: https://phabricator.services.mozilla.com/D179177

mobile/android/chrome/geckoview/geckoview.js

@@ -403,6 +403,9 @@ class ModuleInfo {
    * Called before the browser is removed
    */
   onDestroyBrowser() {
+    if (this._impl) {
+      this._impl.onDestroyBrowser();
+    }
     this._contentModuleLoaded = false;
   }
 

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/MediaSessionTest.kt

@@ -996,4 +996,36 @@ class MediaSessionTest : BaseSessionTest() {
         session.evaluateJS("document.querySelector('video').requestFullscreen()")
         sessionRule.waitForResult(resultFullscreen)
     }
+
+    @Test
+    fun switchingProcess() {
+        // TODO: bug 1810736
+        assumeThat(sessionRule.env.isIsolatedProcess, equalTo(false))
+
+        sessionRule.setPrefsUntilTestEnd(
+            mapOf(
+                "media.autoplay.default" to 0,
+            ),
+        )
+
+        mainSession.loadUri("about:blank")
+        sessionRule.waitForPageStop()
+
+        mainSession.loadTestPath(VIDEO_WEBM_PATH)
+        sessionRule.waitForPageStop()
+
+        val onPlayCalled = GeckoResult<Void>()
+        mainSession.delegateUntilTestEnd(object : MediaSession.Delegate {
+            @AssertCalled(count = 1)
+            override fun onPlay(
+                session: GeckoSession,
+                mediaSession: MediaSession,
+            ) {
+                onPlayCalled.complete(null)
+            }
+        })
+
+        mainSession.evaluateJS("document.querySelector('video').play()")
+        sessionRule.waitForResult(onPlayCalled)
+    }
 }

mobile/android/modules/geckoview/GeckoViewMediaControl.sys.mjs

@@ -9,12 +9,8 @@ export class GeckoViewMediaControl extends GeckoViewModule {
     debug`onInit`;
   }
 
-  onEnable() {
-    debug`onEnable`;
-
-    if (this.controller.isActive) {
-      this.handleActivated();
-    }
+  onInitBrowser() {
+    debug`onInitBrowser`;
 
     const options = {
       mozSystemGroup: true,
@@ -27,6 +23,25 @@ export class GeckoViewMediaControl extends GeckoViewModule {
     this.controller.addEventListener("positionstatechange", this, options);
     this.controller.addEventListener("metadatachange", this, options);
     this.controller.addEventListener("playbackstatechange", this, options);
+  }
+
+  onDestroyBrowser() {
+    debug`onDestroyBrowser`;
+
+    this.controller.removeEventListener("activated", this);
+    this.controller.removeEventListener("deactivated", this);
+    this.controller.removeEventListener("supportedkeyschange", this);
+    this.controller.removeEventListener("positionstatechange", this);
+    this.controller.removeEventListener("metadatachange", this);
+    this.controller.removeEventListener("playbackstatechange", this);
+  }
+
+  onEnable() {
+    debug`onEnable`;
+
+    if (this.controller.isActive) {
+      this.handleActivated();
+    }
 
     this.registerListener([
       "GeckoView:MediaSession:Play",
@@ -45,13 +60,6 @@ export class GeckoViewMediaControl extends GeckoViewModule {
   onDisable() {
     debug`onDisable`;
 
-    this.controller.removeEventListener("activated", this);
-    this.controller.removeEventListener("deactivated", this);
-    this.controller.removeEventListener("supportedkeyschange", this);
-    this.controller.removeEventListener("positionstatechange", this);
-    this.controller.removeEventListener("metadatachange", this);
-    this.controller.removeEventListener("playbackstatechange", this);
-
     this.unregisterListener();
   }
 

mobile/android/modules/geckoview/GeckoViewModule.sys.mjs

@@ -60,6 +60,9 @@ export class GeckoViewModule {
   // Override to initialize the browser before it is bound to the window.
   onInitBrowser() {}
 
+  // Override to cleanup when the browser is destroyed.
+  onDestroyBrowser() {}
+
   // Override to initialize module.
   onInit() {}