We have many projects in chromium that depends on catapult:
tools/perf
content/test/gpu
...

Sometimes, refactoring in catapult causes the PRESUBMIT check of those projects to fail, but the failures are not detected by the catapult roll CL (example:  issue 606706 ) and only detected later by the CLs that make code change to those projects. This leads to confusion & delay in fixing the breakage.

Ideally, we want to run PRESUBMIT of projects that depends on catapult upon catapult roll CLs.