Fix hermes chrome debugger for Flipper
Fix hermes chrome debugger for Flipper

Summary: When Flipper upgraded Electron it broke the iframe sandboxing for devtools, the fix is to use a webview (which requires some CSS fixes to render full screen).

Reviewed By: ArchDev

Differential Revision: D19446243

fbshipit-source-id: 7fd0b0fc922aa6c05c24efc20adce1cb61f24c99

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper