[WebView] Add directory for interfaces between support library and glue
am: 2dcef84ac9

Change-Id: I538754bfcb0082bf1dd6b7c626e26337efea8f58
tree: 9f71fed4dadda8194d3e9d5078659bcdb812bb16
  1. src/
  2. BUILD.gn
  3. DEPS