Allow autoplay unmuted for WebAPK in the manifest scope

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 9156bba583b6c602b3a8cc84b4db479d0b50a85d..87666f21b4fbeb866e3c2dd572ee077afbd92cb6 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -293,12 +293,27 @@ bool isDocumentCrossOrigin(Document& document) {
   return frame && frame->isCrossOriginSubframe();
 }
 
+bool isDocumentWhitelisted(Document& document) {
+  DCHECK(document.settings());
+
+  const String& whitelistScope =
+      document.settings()->getMediaPlaybackGestureWhitelistScope();
+  if (whitelistScope.isNull() || whitelistScope.isEmpty())
+    return false;
+
+  return document.url().getString().startsWith(whitelistScope);
+}
+
 // Return true if and only if the document settings specifies media playback
 // requires user gesture.
 bool computeLockedPendingUserGesture(Document& document) {
   if (!document.settings())
     return false;
 
+  if (isDocumentWhitelisted(document)) {
+    return false;
+  }
+
   if (document.settings()->getCrossOriginMediaPlaybackRequiresUserGesture() &&
       isDocumentCrossOrigin(document)) {
     return true;