Allow autoplay unmuted for WebAPK in the manifest scope

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
index a4b1c4276db161ed389687cfcff0c706c85461dc..d11323bec2094e5ddf4381fca0df9f18af6e9d05 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
@@ -19,10 +19,13 @@ import org.chromium.chrome.browser.tab.TabDelegateFactory;
 import org.chromium.chrome.browser.tab.TabRedirectHandler;
 import org.chromium.components.navigation_interception.NavigationParams;
 import org.chromium.content.browser.ChildProcessCreationParams;
+import org.chromium.content.common.ContentSwitches;
 import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.ui.base.PageTransition;
 import org.chromium.webapk.lib.client.WebApkServiceConnectionManager;
 
+import java.util.ArrayList;
+
 /**
  * An Activity is designed for WebAPKs (native Android apps) and displays a webapp in a nearly
  * UI-less Chrome.
@@ -181,8 +184,18 @@ public class WebApkActivity extends WebappActivity {
         ChildProcessCreationParams params = chrome.getChildProcessCreationParams();
         if (isForWebApk) {
             boolean isExternalService = false;
+            ArrayList<String> additionalCommandLine = new ArrayList<String>();
+            additionalCommandLine.add(
+                    "--" + ContentSwitches.MEDIA_PLAYBACK_GESTURE_WHITELIST_SCOPE
+                    + getWebappInfo().scopeUri());
+            String[] additionalCommandLineArray = new String[additionalCommandLine.size()];
+            for (int i = 0; i < additionalCommandLine.size(); ++i) {
+                additionalCommandLineArray[i] = additionalCommandLine.get(i);
+            }
+
             params = new ChildProcessCreationParams(getWebappInfo().webApkPackageName(),
-                    isExternalService, LibraryProcessType.PROCESS_CHILD);
+                    isExternalService, LibraryProcessType.PROCESS_CHILD,
+                    additionalCommandLineArray);
         }
         ChildProcessCreationParams.set(params);
     }