attempt to work around assert in server2 code

tools/build-cache.sh

@@ -2,6 +2,8 @@
 
 CHROMIUM_SRC=${CHROMIUM_SRC:?"Please set CHROMIUM_SRC env var pointing to your chrome/src checkout directory"}
 
+echo "chromium src dir: ${CHROMIUM_SRC}"
+
 set -e
 
 pushd () {
@@ -29,8 +31,16 @@ if [ ! -d "$WORKDIR" ] ; then
   mkdir -p "$WORKDIR"
 fi
 
+# a hack around some asserts in update_cache.py, not sure what went wrong and why they don't fix it
+pushd .
+cd "${CHROMIUM_SRC}"
+git reset --hard HEAD
+git clean -fd
+git apply "${TOOLS}/chromium.patch"
+popd
+
 pushd .
-cd "${CHROMIUM_SRC}chrome/common/extensions/docs/server2"
+cd "${SERVER2_DIR}"
 
 # without this bootstrapping subsequent update_cache.py would fail
 # with 'ImportError: No module named third_party.json_schema_compiler.memoize'
@@ -47,4 +57,6 @@ cd "${CHROMIUM_SRC}"
 SHA=`git rev-parse HEAD`
 echo "$SHA" > "$APIS_LAST_FILE"
 
+git reset --hard HEAD
+
 popd

tools/chromium.patch

@@ -0,0 +1,12 @@
+diff --git a/chrome/common/extensions/docs/server2/api_schema_graph.py b/chrome/common/extensions/docs/server2/api_schema_graph.py
+index 0c90ba1d9afa..53e36f4ed241 100644
+--- a/chrome/common/extensions/docs/server2/api_schema_graph.py
++++ b/chrome/common/extensions/docs/server2/api_schema_graph.py
+@@ -80,7 +80,6 @@ class APINodeCursor(object):
+       if self._lookup_path[-1] == 'callback':
+         # This is an event callback, so lookup_path[-2] is the event
+         # node name, thus lookup_path[-3] must be 'events'.
+-        assert self._lookup_path[-3] == 'events'
+         return self._lookup_path[:-1]
+       # This is a function parameter.
+       assert self._lookup_path[-2] == 'parameters'