Add chrome.power extension API.

chrome/common/extensions/docs/examples/api/power/_locales/en/messages.json

Index: chrome/common/extensions/docs/examples/api/power/_locales/en/messages.json
diff --git a/chrome/common/extensions/docs/examples/api/power/_locales/en/messages.json b/chrome/common/extensions/docs/examples/api/power/_locales/en/messages.json
new file mode 100644
index 0000000000000000000000000000000000000000..ef50944de1068e827436f7943a24aa4747dcb670
--- /dev/null
+++ b/chrome/common/extensions/docs/examples/api/power/_locales/en/messages.json
@@ -0,0 +1,22 @@
+{
+  "extensionName": {
+    "message": "Keep Awake",
+    "description": "Extension name."
+  },
+  "extensionDescription": {
+    "message": "Override system power-saving settings.",
+    "description": "Extension description."
+  },
+  "disabledTitle": {
+    "message": "Default power-saving settings",
+    "description": "Browser action title when disabled."
+  },
+  "displayTitle": {
+    "message": "Screen will be kept on",
+    "description": "Browser action title when preventing screen-off."
+  },
+  "systemTitle": {
+    "message": "System will stay awake",
+    "description": "Browser action title when preventing system sleep."
+  }
+}