fix(plugin-document-load): check if getEntriesByType is available before using it

[mhennoch]

Which problem is this PR solving?

• When performance.getEntriesByType is undefined error is thrown(and fallback performance.timing is not used). This happens in Safari 10.1 for example where getEntriesByType is undefined but performance.timing is available.

Short description of the changes

• Check if performance.getEntriesByType is present before using it.

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ MartenH (e65ff54)
• ✅ Bartlomiej Obecny (82e1ad5)

[codecov]

Codecov Report

Merging #259 (6cae7c6) into master (d896904) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #259   +/-   ##
=======================================
  Coverage   95.07%   95.07%           
=======================================
  Files         110      110           
  Lines        5888     5888           
  Branches      607      609    +2     
=======================================
  Hits         5598     5598           
  Misses        290      290           

Impacted Files	Coverage Δ
...opentelemetry-instrumentation-graphql/src/types.ts	100.00% <ø> (ø)

[obecny]

lgtm, thx for contribution

[mhennoch]

Any idea when this will get merged?

[obecny]

@mhennoch we cannot merge until you sign the CLA

[mhennoch]

@obecny I signed it after it initially failed. Under checks it says:
EasyCLA — EasyCLA check passed. You are authorized to contribute.

[obecny]

it was marked as not signed, until you commented on PR then the CLA check is run again, now I see it is fine