The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3cf32744d21a6f64e491c167cb995e72fe0d67bc

commit 3cf32744d21a6f64e491c167cb995e72fe0d67bc
Author: Yuke Liao <liaoyuke@chromium.org>
Date: Fri Dec 22 19:07:45 2017

[GN] Implement tracking build dependency files for Items.

This CL implements tracking build dependency files for targets,
configs, toolchains and pools and write corresponding unit tests
to verify the behaviors.

Bug:  795913 
Change-Id: I3f7a9302db0725ef8167160838448e7eb39c4eee
Reviewed-on: https://chromium-review.googlesource.com/838220
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526037}
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/config.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/config.h
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/function_toolchain.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/functions.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/item.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/item.h
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/loader.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/loader_unittest.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/scope.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/scope.h
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/scope_unittest.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/setup.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/target.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/target.h
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/target_generator.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/toolchain.cc
[modify] https://crrev.com/3cf32744d21a6f64e491c167cb995e72fe0d67bc/tools/gn/toolchain.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/da71ef3911f81a7453ea8da4297c0eba9c308748

commit da71ef3911f81a7453ea8da4297c0eba9c308748
Author: Yuke Liao <liaoyuke@chromium.org>
Date: Mon Jan 08 16:46:14 2018

[GN] Implements analyzing dependencies between items.

The goal of this CL is to teach GN analyzer to handle build files.

Previous CL:
https://chromium-review.googlesource.com/c/chromium/src/+/838220
implemented tracking build dependency files for each item that
participates in the build dependency tree.

This CL implements analyzing the dependencies between items so as
to recursively decide the set of items/targets that are either
directly or indirectly affected by a list of modified source files
(including build files).

This CL also writes unit tests to verify the new behaviors.

Bug:  795913 
Change-Id: I5c123180183246f719248415cdc496a154b5e754
Reviewed-on: https://chromium-review.googlesource.com/851080
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527646}
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/analyzer.cc
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/analyzer.h
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/analyzer_unittest.cc
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/args.cc
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/args.h
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/builder.cc
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/builder.h
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/command_analyze.cc
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/item.h
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/setup.cc
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/setup.h
[modify] https://crrev.com/da71ef3911f81a7453ea8da4297c0eba9c308748/tools/gn/source_file.h

fixed?

Yes, thanks!