[iOS] Refactoring XcodeWriter::CreateProductsProject.

|XcodeWriter::CreateProductsProject| in xcode_writer.cc has evolved
into a giant function, so this CL makes it smaller by refactoring the
logic that adds source files to the project for indexing into a
separate function.

Bug: 709289
Change-Id: I19fab218e1af87a87cacf8f65f19c2acf8091713
Reviewed-on: https://chromium-review.googlesource.com/563650
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#485529}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6eb496ce333c630963d608e9f3a6fd177ecb29c4
1 file changed
tree: b5ebb0a3d0342cbe22cc7c3a1de7b62a8a7bdde2
  1. tools/