Fix build issue where module-import code gets dropped from the bundle

[dsmilkov]

backend_cpu.ts and backend_webgl.ts are never included from index.ts even though there is
export {WebGLTimingInfo} from './kernels/backend_webgl';. That export is just a Typescript interface, and gets compiled away in the es5 code.

This change is 

[nsthorat]

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Review status: 0 of 1 files reviewed at latest revision, all discussions resolved.

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src/index.ts, line 18 at r1 (raw file):

 */

import './kernels/backend_webgl';

can you put a comment here saying why you need this so we don't forget and delete it?

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Comments from Reviewable

[dsmilkov]

Review status: 0 of 1 files reviewed at latest revision, 1 unresolved discussion.

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src/index.ts, line 18 at r1 (raw file):

Previously, nsthorat (Nikhil Thorat) wrote…

can you put a comment here saying why you need this so we don't forget and delete it?

Done.

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Comments from Reviewable