Add tests for the Display operation of the mac notification bridge.

chrome/browser/DEPS

 include_rules = [
   "+apps",
   "+ash",
   "+chrome/app",
   "+chrome/chrome_watcher",
   "+chrome/grit",
   "+chrome/install_static",
   "+chrome/installer",
   "+chrome_elf/blacklist",
   "+chrome_elf/chrome_elf_constants.h",
@@ skipping 59 matching lines @@
   "-ipc/ipc_sync_message_filter.h",
 
   # Other libraries.
   "+libxml",
   "+third_party/google_toolbox_for_mac/src",
   "+third_party/icu/source/common/unicode",
   "+third_party/icu/source/i18n/unicode",
   "+third_party/leveldatabase",
   "+third_party/libxml",
   "+third_party/mozilla",     # Mozilla interface headers.
+  "+third_party/ocmock/gtest_support.h",
   "+third_party/protobuf/src/google/protobuf",
   "+third_party/re2",
   "+third_party/smhasher",
   "+third_party/sqlite",
   "+third_party/zlib",
 
   # No inclusion of WebKit from the browser, other than strictly enum/POD,
   # header-only types, and some selected common code.
   "-third_party/WebKit",
   "+third_party/WebKit/public/platform/WebDisplayMode.h",
@@ skipping 17 matching lines @@
   "+third_party/WebKit/public/web/WebWindowFeatures.h",
 ]
 
 specific_include_rules = {
   # Exploits don't abide by DEPS; so all IPC message definitions are fair game
   # in this type of test.
   'chrome_security_exploit_browsertest\.cc' : [
     '+content/common',
   ],
 }