Include "public" source files in generated Xcode project.

Targets can restrict the list of public headers by using "public"
property in addition to "sources". Include them in the generated
Xcode project as any other source file.

BUG=None

Review-Url: https://codereview.chromium.org/2740123003
Cr-Original-Commit-Position: refs/heads/master@{#456339}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5d93a97915ac8492667e3fbedfc26f606e1d1099
1 file changed
tree: 8aff6b5bba8fc007574e4f356582b9eb04d2e067
  1. tools/