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..2ebcc9f6150e2e25d1a00cf291be6220ba6440bd 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 +3027,10 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
                 && !TextUtils.equals(getAppAssociatedWith(), packageName);
     }
 
+    public void setWebappManifestScope(String scope) {

[Ted C, 2017/02/15 05:07:25]

this needs javadoc...because I have no idea what this actually means

[Zhiqiang Zhang (Slow), 2017/02/15 11:29:51]

Done.

+        nativeSetWebappManifestScope(mNativeTabAndroid, scope);
+    }
+
     private native void nativeInit();
     private native void nativeDestroy(long nativeTabAndroid);
     private native void nativeInitWebContents(long nativeTabAndroid, boolean incognito,
@@ -3056,4 +3060,5 @@ 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);
 }