Implement "appinstalled" event on Android.

third_party/WebKit/Source/core/frame/WindowInstallation.idl

Index: third_party/WebKit/Source/core/frame/WindowInstallation.idl
diff --git a/third_party/WebKit/Source/modules/webaudio/WindowAudioWorklet.idl b/third_party/WebKit/Source/core/frame/WindowInstallation.idl
similarity index 56%
copy from third_party/WebKit/Source/modules/webaudio/WindowAudioWorklet.idl
copy to third_party/WebKit/Source/core/frame/WindowInstallation.idl
index 5ab9930218ade68e528e5364a3f108a42720f33d..e4da90b7090a84e47314282dcd475f06735e29d9 100644
--- a/third_party/WebKit/Source/modules/webaudio/WindowAudioWorklet.idl
+++ b/third_party/WebKit/Source/core/frame/WindowInstallation.idl
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://webaudio.github.io/web-audio-api/#AudioWorklet
+// https://www.w3.org/TR/appmanifest/#extensions-to-the-window-object
 
 [
-    RuntimeEnabled=AudioWorklet,
+    ImplementedAs=DOMWindowInstallation,
 ] partial interface Window {
-    readonly attribute Worklet audioWorklet;
+    attribute EventHandler onappinstalled;
 };