tooltip: does not take one time binding into account and sets watcher

[david-gang]

Actual Behavior:

• What is the issue? *
  tooltip sets up watcher even if we have one time binding.
• What is the expected behavior?
  tooltip should set up watchers only if we don't have one time binding.

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue:
• Details:

Given this html:

        <md-tooltip md-delay="400">
            {{::(mylabel |translate)}}"
        </md-tooltip>

The tooltip.js has the following code:

      if (element.text().indexOf($interpolate.startSymbol()) > -1) {
        scope.$watch(function() {
          return element.text().trim();
        }, addAriaLabel);
      }

We should somehow add the exception that it is not one time binding.

Angular Versions: *

• Angular Version: 1.5.8
• Angular Material Version: 1.1.0

Additional Information:

• Browser Type: *
• Browser Version: *
• OS: *
• Stack Traces: