Introduce background.scripts feature for extension manifests.

This optimizes for the common use case where background pages
just include a reference to one or more script files and no
additional HTML.

BUG=107791


Review URL: http://codereview.chromium.org/9150008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@117110 0039d316-1c4b-4281-b951-d872f2087c98
void TestingAutomationProvider::SendWebkitKeyEvent(
    DictionaryValue* args,
    IPC::Message* reply_message) {
  if (SendErrorIfModalDialogActive(this, reply_message))
    return;

  NativeWebKeyboardEvent event;
  std::string error;
  if (!BuildWebKeyEventFromArgs(args, &error, &event)) {
    AutomationJSONReply(this, reply_message).SendError(error);
    return;
  }

  RenderViewHost* view;
  if (!GetRenderViewFromJSONArgs(args, profile(), &view, &error)) {
    AutomationJSONReply(this, reply_message).SendError(error);
    return;
  }
  new InputEventAckNotificationObserver(this, reply_message, event.type, 1);
  view->ForwardKeyboardEvent(event);
}

void TestingAutomationProvider::SendWebkitKeyEvent(
    DictionaryValue* args,
    IPC::Message* reply_message) {
  if (SendErrorIfModalDialogActive(this, reply_message))
    return;

  NativeWebKeyboardEvent event;
  std::string error;
  if (!BuildWebKeyEventFromArgs(args, &error, &event)) {
    AutomationJSONReply(this, reply_message).SendError(error);
    return;
  }

  RenderViewHost* view;
  if (!GetRenderViewFromJSONArgs(args, profile(), &view, &error)) {
    AutomationJSONReply(this, reply_message).SendError(error);
    return;
  }
  new InputEventAckNotificationObserver(this, reply_message, event.type, 1);
  view->ForwardKeyboardEvent(event);
}
