Gracefully handle ScriptProcessorNode event processing when detached.

Check that we have an ExecutionContext to deliver a process event to
before dispatching.

R=haraken@chromium.org
BUG=394718

Review URL: https://codereview.chromium.org/398573005

git-svn-id: svn://svn.chromium.org/blink/trunk@178385 bbb929c8-8fbe-4397-9dbb-9b2b20218538
4 files changed
tree: 76814b317dd2e9b6fd1c585c9720c61ec43170b6
  1. third_party/