tree ff6390f5b5e48890669e3d4c0d5001909690e713
parent da92f7150ac8dbee1e111661c6628b13308e5fbe
author Wyatt Allen <wyatta@google.com> 1467135213 -0700
committer Wyatt Allen <wyatta@google.com> 1467221801 -0700

Refactor gr-diff-processor to use an asynchronous loop

Modifies the `process` method of gr-diff-processor to traverse diff
content using an asynchronous recursive loop rather than a blocking
for-loop. The async version maintains the promise interface already
established.

Refactored to constrain side-effects to the `process` method. Whereas,
formerly, helper methods in gr-diff-processor both read and wrote the
component's internal state, they are rewritten to be more pure, making
them simpler to understand, test, and invoke asynchronously.

Documentation is added throughout as well as tests for helper functions.

Note that this change only makes the processing step asynchronous.
Upgrading the diff-rendering stage to be non-blocking will come in a
later change.

Change-Id: Ifd50eeb75797b173937890caacc92cad5675fc20