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Record the "bundle_data" target corresponding to a BundleFileRule object
so that the dependencies can be correctly computed when generating the
ninja steps for the "create_bundle" target.

Change the "stamp" step of "bundle_data" target in the generated ninja
to depends on the target dependencies and source files.

Change the "copy_bundle_data" steps of "create_bundle" target in the
generated ninja to depends on the "bundle_data" target that defined
the corresponding source files.

Change the "compile_xcassets" step of "create_bundle" target in the
generated ninja to depends on all the "bundle_data" targets that defined
the corresponding source files.

Change the rule used to determine whether a "bundle_data" source file
is part of an assets catalog (some file where incorrectly omitted causing
them to be incorrectly copied to the final bundle).

All those changes will allow the "copy_bundle_data" and "compile_xcassets"
steps to only depends on the targets that generate them (if any) and will
reduce the number of file copied into the final bundle during incremental
builds.

Fix unit tests with new expectations.

BUG=623501

Review-Url: https://codereview.chromium.org/2105613003
Cr-Commit-Position: refs/heads/master@{#403304}