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",  # For generated headers
   "+chrome/installer",
   "+chrome_elf/blacklist",
   "+chrome_elf/chrome_elf_constants.h",
   "+chrome_elf/create_file",
@@ skipping 69 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/ocmock/OCMock/OCMock.h",

[Nico, 2016/07/12 17:54:38]

why is this needed? we already have many files in c/b that use ocmock:
https://cs.chromium.org/search/?q=ocmock.h+file:chrome&sq=package:chromium&ty...
As far as I can tell, they don't allow this in subdirectory DEPS files.

[Miguel Garcia, 2016/07/13 14:05:16]

I looked a some of those results and all of them had a DEPS rule somewhere in
their path to allow OCMock explicitly. 
https://cs.chromium.org/chromium/src/chrome/browser/renderer_host/DEPS
https://cs.chromium.org/chromium/src/chrome/browser/ui/cocoa/DEPS
https://cs.chromium.org/chromium/src/ios/DEPS

Worth noting that if I revert this file I get a presubmit error as well

Running presubmit commit checks ...

** Presubmit ERRORS **
You added one or more #includes that violate checkdeps rules.
  chrome/browser/notifications/notification_platform_bridge_mac_unittest.mm
      Illegal include: "third_party/ocmock/OCMock/OCMock.h"
    Because of no rule applying. \
  chrome/browser/notifications/notification_platform_bridge_mac_unittest.mm
      Illegal include: "third_party/ocmock/gtest_support.h"
    Because of no rule applying.


Would you prefer if I added a new DEPS file in chrome/browser/notifications ?

   "+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",
   "+third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h",
   "+third_party/WebKit/public/platform/WebReferrerPolicy.h",
   "+third_party/WebKit/public/platform/modules/app_banner/WebAppBannerPromptReply.h",
   "+third_party/WebKit/public/platform/modules/notifications/WebNotificationConstants.h",
   "+third_party/WebKit/public/platform/modules/push_messaging/WebPushPermissionStatus.h",
   "+third_party/WebKit/public/platform/modules/screen_orientation/WebScreenOrientationLockType.h",
   "+third_party/WebKit/public/platform/modules/permissions/permission_status.mojom.h",
   "+third_party/WebKit/public/web/WebCache.h",
   "+third_party/WebKit/public/web/WebContextMenuData.h",
   "+third_party/WebKit/public/web/WebFindOptions.h",
   "+third_party/WebKit/public/web/WebInputEvent.h",
   "+third_party/WebKit/public/web/WebMediaPlayerAction.h",
   "+third_party/WebKit/public/web/WebPluginAction.h",
   "+third_party/WebKit/public/web/WebTextDirection.h",
   "+third_party/WebKit/public/web/WebWindowFeatures.h",
 ]