Allow autoplay unmuted for WebAPK in the manifest scope

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 2f573f6189295b7ac05c85ae2d4a2a1fbea1ffff..95b6509269ceec41896ca87367cf6fe2d44e0374 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -3027,6 +3027,14 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
                 && !TextUtils.equals(getAppAssociatedWith(), packageName);
     }
 
+    /**
+     * Set the Webapp manifest scope, which is used to allow frames within the scope to autoplay
+     * media unmuted.
+     */
+    public void setWebappManifestScope(String scope) {
+        nativeSetWebappManifestScope(mNativeTabAndroid, scope);
+    }
+
     private native void nativeInit();
     private native void nativeDestroy(long nativeTabAndroid);
     private native void nativeInitWebContents(long nativeTabAndroid, boolean incognito,
@@ -3056,4 +3064,5 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
     private native void nativeAttachToTabContentManager(long nativeTabAndroid,
             TabContentManager tabContentManager);
     private native boolean nativeHasPrerenderedUrl(long nativeTabAndroid, String url);
+    private native void nativeSetWebappManifestScope(long nativeTabAndroid, String scope);
 }