Add include/ to include dir list for gcmole

BUG=
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1748343002

Cr-Commit-Position: refs/heads/master@{#34381}

tools/gcmole/gcmole.lua

@@ -111,6 +111,7 @@ local function MakeClangCommandLine(
       .. " -DENABLE_DEBUGGER_SUPPORT"
       .. " -DV8_I18N_SUPPORT"
       .. " -I./"
+      .. " -Iinclude/"
       .. " -Ithird_party/icu/source/common"
       .. " -Ithird_party/icu/source/i18n"
       .. " " .. arch_options