Add a virtual keyboard webui at chrome://keyboard/

chrome/browser/extensions/component_loader.cc

Index: chrome/browser/extensions/component_loader.cc
diff --git a/chrome/browser/extensions/component_loader.cc b/chrome/browser/extensions/component_loader.cc
index 89ee5a3cee4cced52048d6e2809e0bd5972d7870..a871abb56262baea8fc899ac5c575273948d2ec1 100644
--- a/chrome/browser/extensions/component_loader.cc
+++ b/chrome/browser/extensions/component_loader.cc
@@ -28,6 +28,10 @@
 #include "grit/browser_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 
+#if defined(USE_AURA)
+#include "grit/keyboard_resources.h"
+#endif
+
 #if defined(OFFICIAL_BUILD)
 #include "chrome/browser/defaults.h"
 #endif
@@ -333,6 +337,12 @@ void ComponentLoader::AddChromeApp() {
 #endif
 }
 
+void ComponentLoader::AddKeyboardApp() {
+#if defined(USE_AURA)
+  Add(IDR_KEYBOARD_MANIFEST, base::FilePath(FILE_PATH_LITERAL("keyboard")));
+#endif
+}
+
 // static
 void ComponentLoader::EnableBackgroundExtensionsForTesting() {
   enable_background_extensions_during_testing = true;
@@ -387,6 +397,8 @@ void ComponentLoader::AddDefaultComponentExtensions(
     AddChromeApp();
   }
 
+  AddKeyboardApp();
+
   AddDefaultComponentExtensionsWithBackgroundPages(skip_session_components);
 }