UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
1. Use relative includes
2. Add include_dirs to target
3. Run gn gen out/Default --ide=xcode
4. Open Xcode project and cmd-click on relative include

What is the expected behavior?
Xcode will open included file

What went wrong?
Nothing happends

Did this work before? N/A 

Chrome version: 66.0.3359.139  Channel: stable
OS Version: OS X 10.12.6
Flash Version: 

INC or INC should be set according to include_dirs.

As Xcode project uses separate target for source indexing, it isn't obvious what include_dirs option should be used. In our standalone project we have several Include folders that is set in default configs for all targets - at least such default options should be applied to sources target
Better solution might be to collect include_dirs from all targets that is used for project generation. It may also be easier to implement, but may have performance impact in generated project usage. Maybe even additional filter cli option should be added to specify from which targets include_dirs should be collected