Add extension permissions for Media Gallery API.

chrome/common/extensions/permissions/permission_set.cc

Index: chrome/common/extensions/permissions/permission_set.cc
diff --git a/chrome/common/extensions/permissions/permission_set.cc b/chrome/common/extensions/permissions/permission_set.cc
index de34a869b67c9e58024c01097a76fe4982d981a0..5b51616c1e88b03e6795467af0a3966ae488d046 100644
--- a/chrome/common/extensions/permissions/permission_set.cc
+++ b/chrome/common/extensions/permissions/permission_set.cc
@@ -498,6 +498,10 @@ void PermissionSet::InitImplicitPermissions() {
   // The fileBrowserHandler permission implies the internal version as well.
   if (apis_.find(APIPermission::kFileBrowserHandler) != apis_.end())
     apis_.insert(APIPermission::kFileBrowserHandlerInternal);
+
+  // mediaGalleriesRead implies the mediaGalleries permission.
+  if (apis_.find(APIPermission::kMediaGalleriesRead) != apis_.end())
+    apis_.insert(APIPermission::kMediaGalleries);
 }
 
 void PermissionSet::InitImplicitExtensionPermissions(