athena: Provide a temporary onTextInputBoxFocused.addListener implementation.

The virtual keyboard bindings will be provided by mojo soon. Until then, this is
a temporary hack to provide an implementation for the missing API. The virtual
keyboard shows up in athena with this last change.

BUG=380215
R=bshe@chromium.org, oshima@chromium.org

Review URL: https://codereview.chromium.org/348823003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278841 0039d316-1c4b-4281-b951-d872f2087c98

athena/virtual_keyboard/virtual_keyboard_bindings_impl.cc

@@ -106,6 +106,17 @@ class VKBindings : public gin::Wrappable<VKBindings> {
       return;
     chrome->Set(gin::StringToSymbol(isolate, "virtualKeyboardPrivate"),
                 controller.ToV8());
+
+    const std::string kInputBoxFocusedEvent =
+        "chrome.virtualKeyboardPrivate.onTextInputBoxFocused = {};"
+        "chrome.virtualKeyboardPrivate.onTextInputBoxFocused.addListener = "
+        "   function(callback) { "
+        "     window.setTimeout(function() {"
+        "       callback({type: 'text'});"
+        "     }, 100);"
+        "   };";
+    render_view->GetMainRenderFrame()->ExecuteJavaScript(
+        base::UTF8ToUTF16(kInputBoxFocusedEvent));
   }
 
  private: