engine: name all scopes by default

[ChALkeR]

Description

TypeScript doesn't catch that — .name is expected to be a string in runKernel -> profileKernel -> logKernelProfile.

Without this, test-node prints unhandled rejections due to name being undefined in that code path.

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This change is 

[ChALkeR]

tfjs-core/src/jasmine_util.ts

Lines 133 to 135 in 2fe1567

	beforeEach(() => {
	ENV.engine.startScope();
	});

starts unnamed scopes and causes the abovementioned problem.

Alternatively, scope name could be required in startScope, but that would be an incompatible change.

[nsthorat]

Reviewed 1 of 1 files at r1.
Reviewable status: 0 of 1 approvals obtained