Mojoify PoweMonitorMessageBroadcaster IPC from browser to child process

content/public/app/mojo/content_browser_manifest.json

Index: content/public/app/mojo/content_browser_manifest.json
diff --git a/content/public/app/mojo/content_browser_manifest.json b/content/public/app/mojo/content_browser_manifest.json
index 55172e46baf796e6c32dade277e06fb61ad898bd..cff75fbb38a9639b2332a3793f315343c3c97703 100644
--- a/content/public/app/mojo/content_browser_manifest.json
+++ b/content/public/app/mojo/content_browser_manifest.json
@@ -6,8 +6,12 @@
   "capabilities": {
     // Remove this once http://crbug.com/632818 is fixed.
     "provided": {
-      "gpu": [ ],
-      "plugin":  [ ],
+      "gpu": [
+        "device::mojom::PowerMonitor"
+      ],
+      "plugin":  [
+        "device::mojom::PowerMonitor"
+      ],
       "renderer": [
         "blink::mojom::BackgroundSyncService",
         "blink::mojom::BroadcastChannelProvider",
@@ -29,6 +33,7 @@
         "device::mojom::LightSensor",
         "device::mojom::MotionSensor",
         "device::mojom::OrientationSensor",
+        "device::mojom::PowerMonitor",
         "device::mojom::TimeZoneMonitor",
         "media::mojom::ImageCapture",
         "memory_coordinator::mojom::MemoryCoordinatorHandle"