[Ozone] Add Ozone EGL demo

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/356083002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@281317 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -1183,6 +1183,7 @@
             ['use_ozone==1', {
               'dependencies': [
                 '../ui/ozone/ozone.gyp:*',
+                '../ui/ozone/demo/ozone_demos.gyp:*',
               ],
               'dependencies!': [
                 '../chrome/chrome.gyp:interactive_ui_tests',  # crbug.com/362166