Add pdfium_test to the chromium_builder_asan target.

R=jam@chromium.org
BUG=

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

git-svn-id: http://src.chromium.org/svn/trunk/src/build@273027 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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', {