Merge "Fix parsing the EGL extension string."

        mExtensionString.setTo(gBuiltinExtensionString);

        char const* start = gExtensionString;

        char const* end;

        do {

            // find the space separating this extension for the next one

            end = strchr(start, ' ');

            if (end) {

                // length of the extension string

                const size_t len = end - start;

            // length of the extension name

            size_t len = strcspn(start, " ");

            if (len) {

                // NOTE: we could avoid the copy if we had strnstr.

                const String8 ext(start, len);

                if (findExtension(disp.queryString.extensions, ext.string(),

                        len)) {

                        mExtensionString.append(start, len+1);

                    mExtensionString.append(ext + " ");

                }

                // advance to the next extension name, skipping the space.

                start += len;

                start += (*start == ' ') ? 1 : 0;

            }

                // process the next extension string, and skip the space.

                start = end + 1;

            }

        } while (end);

        } while (*start != '\0');

        egl_cache_t::get()->initialize(this);