Adds the input method private API to allow the component IME extension to change the XKB layout.

chrome/browser/chromeos/extensions/input_method_api.h

Index: chrome/browser/chromeos/extensions/input_method_api.h
diff --git a/chrome/browser/chromeos/extensions/input_method_api.h b/chrome/browser/chromeos/extensions/input_method_api.h
index 40b1e400f67b137db6a95e57b5a1d4f4fa8cf0f4..8b8b442e926d20e0d01db380056d1a3a7fb3b157 100644
--- a/chrome/browser/chromeos/extensions/input_method_api.h
+++ b/chrome/browser/chromeos/extensions/input_method_api.h
@@ -139,6 +139,23 @@ class InputMethodPrivateGetEncryptSyncEnabledFunction
   DISALLOW_COPY_AND_ASSIGN(InputMethodPrivateGetEncryptSyncEnabledFunction);
 };
 
+// Implements the inputMethodPrivate.setXkbLayout method.
+class InputMethodPrivateSetXkbLayoutFunction
+    : public UIThreadExtensionFunction {
+ public:
+  InputMethodPrivateSetXkbLayoutFunction() {}
+
+ protected:
+  ~InputMethodPrivateSetXkbLayoutFunction() override {}
+
+  ResponseAction Run() override;
+
+ private:
+  DECLARE_EXTENSION_FUNCTION("inputMethodPrivate.setXkbLayout",
+                             INPUTMETHODPRIVATE_SETXKBLAYOUT)
+  DISALLOW_COPY_AND_ASSIGN(InputMethodPrivateSetXkbLayoutFunction);
+};
+
 class InputMethodAPI : public BrowserContextKeyedAPI,
                        public extensions::EventRouter::Observer {
  public: