Make WebGLRenderingContext.getAttachedShaders() return type nullable

This allows it to return null when the context is lost or when an error
occurs, without resorting to a custom binding for the method.

BUG=390780

Review URL: https://codereview.chromium.org/386953002

git-svn-id: svn://svn.chromium.org/blink/trunk@177935 bbb929c8-8fbe-4397-9dbb-9b2b20218538
6 files changed
tree: c8fb3cc7efa20564f09a411ad709f6d48939f915
  1. third_party/