Reland
596ff54335b2a1b393af10657bc4945114f3beed - Split API bundle generation steps
* Fixed in this version: dependencies for *_api_registration on *_api.
Split bundle generation steps so that API registration is generated in browser, not common.
We now have schema generation, schema bundle generation, and schema bundle registration generation; the last of these is generated in a separate build target and output to browser rather than common.
Fix a couple of dangling gyp issues also.
BUG=405226
TBR=scottmg@chromium.org,sky@chromium.org
Review URL: https://codereview.chromium.org/
513633002
Cr-Commit-Position: refs/heads/master@{#292090}