Adding build rules for fuzzer (internal only)

BUG=

Review URL: https://codereview.chromium.org/66313008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236050 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/build/common.gypi b/build/common.gypi
index b967fda..e1bfe69 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1121,6 +1121,9 @@
     # Set to 1 to compile with the OpenGL ES 2.0 conformance tests.
     'internal_gles2_conform_tests%': 0,
 
+    # Set to 1 to compile the filter fuzzer.
+    'internal_filter_fuzzer%': 0,
+
     # NOTE: When these end up in the Mac bundle, we need to replace '-' for '_'
     # so Cocoa is happy (http://crbug.com/20441).
     'locales': [