Merge to XFA: Run GYP after gclient sync.

TBR=thestig@chromium.org
Original Review URL: https://codereview.chromium.org/1193563002.

Review URL: https://codereview.chromium.org/1193623003.
diff --git a/DEPS b/DEPS
index af90a67..dbbc207 100644
--- a/DEPS
+++ b/DEPS
@@ -29,9 +29,18 @@
 }
 
 include_rules = [
- '+core/include',
- '+fpdfsdk/include',
- '+public',
- '+testing',
- '+third_party/base',
+  '+core/include',
+  '+fpdfsdk/include',
+  '+public',
+  '+testing',
+  '+third_party/base',
 ]
+
+hooks = [
+  {
+    # A change to a .gyp, .gypi, or to GYP itself should run the generator.
+    'name': 'gyp',
+    'pattern': '.',
+    'action': ['python', 'build/gyp_pdfium'],
+  },
+]
\ No newline at end of file