WebGL tests are running incorrectly

[mattsoulanille]

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System information

• Have I written custom code (as opposed to using a stock example script provided in TensorFlow.js):
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04):
• Mobile device (e.g. iPhone 8, Pixel 2, Samsung Galaxy) if the issue happens on mobile device:
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Describe the current behavior
WebGL tests are running core tests using the CPU backend, and the WebGL tests themselves are not actually being run.

Describe the expected behavior
WebGL runs core tests using the webgl backend and runs its own tests.

Standalone code to reproduce the issue
Provide a reproducible test case that is the bare minimum necessary to generate
the problem. If possible, please share a link to Colab/CodePen/any notebook.

1. In tfjs-backend-webgl, run yarn bazel run :tfjs-backend-webgl_test.
2. Click debug on the Chrome window that opens.
3. Open the chrome debug tools.
4. Search for a webgl test name in the logs, e.g. fromPixels + regular math opfromPixels + regular math op from webgl_ops_test.ts. It does not appear in the logs, meaning that test was not run.
5. Open a tfjs-core test, e.g. mat_mul_test.ts, and pause in a spec. Then, look at _tfengine.backendName. It is cpu.

Other info / logs Include any logs or source code that would be helpful to
diagnose the problem. If including tracebacks, please include the full
traceback. Large logs and files should be attached.

[google-ml-butler]

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