Add test coverage for NotificationActivator::Activate in notification_helper

We introduce notification_helper_launches_chrome_unittest, which is evolution
of notification_helper_process_unittest. In addition to testing the launch of
notification_helper by the OS which is notification_helper_process_unittest
all about, the new unit test also tests if chrome.exe can be successfully
launched by notification_helper.exe via the NotificationActivator::Activate
function.

This new unit test is compiled into unit_tests.exe under chrome rather than
notification_helper_unittests.exe. This is because unit_tests.exe has data
dependency on chrome.exe which is required by this new unit test, and it's
undesired to make notification_helper_unittests.exe have data dependency on
chrome.exe.

Bug: 734095
Change-Id: I07ac90a84d7f885a359867f79ce613a194e0bb64
Reviewed-on: https://chromium-review.googlesource.com/1002132
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551540}

chrome/browser/notifications/OWNERS

@@ -14,6 +14,7 @@ per-file *_mac*=rsesek@chromium.org
 # Windows files
 per-file *_win*=finnur@chromium.org
 per-file notification_template_builder*=finnur@chromium.org
+per-file notification_helper_launches_chrome_unittest.cc=file://notification_helper/OWNERS
 
 per-file *permission_context*=file://chrome/browser/permissions/PERMISSIONS_OWNERS
 

chrome/test/BUILD.gn

@@ -63,6 +63,8 @@ static_library("test_support") {
     "base/dialog_test_browser_window.h",
     "base/find_in_page_observer.cc",
     "base/find_in_page_observer.h",
+    "base/process_inspector_win.cc",
+    "base/process_inspector_win.h",
     "base/scoped_browser_locale.cc",
     "base/scoped_browser_locale.h",
     "base/scoped_bundle_swizzler_mac.h",
@@ -3151,9 +3153,14 @@ test("unit_tests") {
 
     if (is_win) {
       sources += [
+        "../browser/notifications/notification_helper_launches_chrome_unittest.cc",
         "../browser/notifications/notification_launch_id_unittest.cc",
         "../browser/notifications/notification_platform_bridge_win_unittest.cc",
       ]
+
+      deps += [ "//chrome/installer/util:with_no_strings" ]
+
+      data_deps += [ "//notification_helper" ]
     }
   }
 
@@ -4616,8 +4623,6 @@ if (!is_android) {
       "base/interactive_test_utils_mac.mm",
       "base/interactive_test_utils_win.cc",
       "base/interactive_ui_tests_main.cc",
-      "base/process_inspector_win.cc",
-      "base/process_inspector_win.h",
       "base/save_desktop_snapshot_win.cc",
       "base/save_desktop_snapshot_win.h",
       "base/view_event_test_platform_part.h",