Add pdfium_test to the chromium_builder_asan target.

R=jam@chromium.org
BUG=

Review URL: https://codereview.chromium.org/303663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273027 0039d316-1c4b-4281-b951-d872f2087c98

build/all.gyp

@@ -661,6 +661,7 @@
             ['chromeos==0', {
               'dependencies': [
                 '../v8/src/d8.gyp:d8#host',
+                '../third_party/pdfium/samples/samples.gyp:pdfium_test',
               ],
             }],
             ['internal_filter_fuzzer==1', {