Add a dependency from the debugger on tools.gyp:url_data_manager.

BUG=skia:4947
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1695753003

Review URL: https://codereview.chromium.org/1695753003
diff --git a/gyp/debugger.gyp b/gyp/debugger.gyp
index c86538d..cac7d5a 100644
--- a/gyp/debugger.gyp
+++ b/gyp/debugger.gyp
@@ -137,6 +137,7 @@
         'debugger_qt_mocs',
         'skia_lib.gyp:skia_lib',
         'jsoncpp.gyp:jsoncpp',
+        'tools.gyp:url_data_manager',
       ],
       'cflags': [
         # Clang gets confused by QWeakPointer, see http://llvm.org/bugs/show_bug.cgi?id=13127