Use corebox dimensions to render triangles (#624)
Use corebox dimensions to render triangles (#624)

Previously, triangles within function nodes that represented inputs and outputs ops had relied on the wrong width and height, resulting in stretched triangles.

Now, the triangles use the dimensions of their core box, as was already the case with ellipses representing normal ops.
qiuminxu/tensorboard,francoisluus/tensorboard-supervise,qiuminxu/tensorboard,tensorflow/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,francoisluus/tensorboard-supervise,francoisluus/tensorboard-supervise,francoisluus/tensorboard-supervise,qiuminxu/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,tensorflow/tensorboard