[DeviceService] Add end-to-end browsertest for PowerMonitor

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 7e1d53935e5a06e226924d62cefc1d0bdbfa39bc..b4fb4444feb67b5b3f86dce083b35fc18a1a1139 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -680,6 +680,7 @@ test("content_browsertests") {
     "../browser/pointer_lock_browsertest.cc",
     "../browser/pointer_lock_browsertest.h",
     "../browser/pointer_lock_browsertest_mac.mm",
+    "../browser/power_monitor_browsertest.cc",
     "../browser/presentation/presentation_browsertest.cc",
     "../browser/renderer_host/input/composited_scrolling_browsertest.cc",
     "../browser/renderer_host/input/interaction_mq_dynamic_browsertest.cc",
@@ -768,6 +769,7 @@ test("content_browsertests") {
     "//content/public/renderer",
     "//content/renderer:for_content_tests",
     "//content/shell:content_shell_lib",
+    "//content/shell:mojo_bindings",
     "//content/shell:pak",
     "//content/test:test_support",
     "//device/base/synchronization",