Consistent op color in profile plugin trace viewer

Consider Stack Overflow for getting support using TensorBoard - they have a larger community with better searchability:

https://stackoverflow.com/questions/tagged/tensorboard

For bug reports, please include the following:

• TensorBoard version (from pip package, also printed out when running tensorboard)
  N/A
• TensorFlow version if different from TensorBoard
  N/A
• OS Platform and version (e.g., Linux Ubuntu 16.04)
  N/A
• Python version (e.g. 2.7, 3.5)
  N/A
• For browser-related issues:
  • Browser type and version (e.g. Chrome 64.0.3282.140)
  • Screenshot if it's a visual issue

Please describe the bug as clearly as possible, and if possible provide a minimal example (code, data, and/or command line) to reproduce the issue. Thanks!

This is a feature request. It will make it easier for user to compare tracing result of different runs.

The issue names the profile plugin trace viewer but provides no file, test, or entry point. Start by locating that viewer and determining how operation colors are currently assigned across different runs. Done means the same operation uses a consistent color when comparing tracing results, with the behavior verified in the relevant viewer tests if they exist.