Doc server: support interfaces in src/extensions

chrome/common/extensions/docs/server2/availability_finder.py

Index: chrome/common/extensions/docs/server2/availability_finder.py
diff --git a/chrome/common/extensions/docs/server2/availability_finder.py b/chrome/common/extensions/docs/server2/availability_finder.py
index c0cf95e9bb79f776182202d75b3a69e0b415e141..ffa85293f727971d26477b65e6c8cec9ab411e81 100644
--- a/chrome/common/extensions/docs/server2/availability_finder.py
+++ b/chrome/common/extensions/docs/server2/availability_finder.py
@@ -7,7 +7,7 @@ import posixpath
 
 from api_schema_graph import APISchemaGraph
 from branch_utility import BranchUtility
-from extensions_paths import API, JSON_TEMPLATES
+from extensions_paths import API, CORE_API, JSON_TEMPLATES
 from third_party.json_schema_compiler.model import UnixName
 
 
@@ -95,24 +95,28 @@ class AvailabilityFinder(object):
     single _EXTENSION_API file which all APIs share in older versions of Chrome,
     in which case it is unknown whether the API actually exists there.
     '''
-    def under_api_path(path):
-      return API + path
+    def find_schema_under_path(api_name, path):
+      # |file_system| will cache the results from the ReadSingle() call.
+      if not file_system.Exists(path).Get():
+        return None
+      filenames = file_system.ReadSingle(path).Get()
+      for ext in ('json', 'idl'):
+        filename = '%s.%s' % (api_name, ext)
+        if filename in filenames:
+          return path + filename
+      if _EXTENSION_API in filenames:
+        return path + _EXTENSION_API
+      # API schema data could not be found in any .json or .idl file.
+      return None
 
     if version == 'trunk' or version > _ORIGINAL_FEATURES_MIN_VERSION:
       # API schema filenames switch format to unix_hacker_style.
       api_name = UnixName(api_name)
 
-    # |file_system| will cache the results from the ReadSingle() call.
-    filenames = file_system.ReadSingle(API).Get()
-
-    for ext in ('json', 'idl'):
-      filename = '%s.%s' % (api_name, ext)
-      if filename in filenames:
-        return under_api_path(filename)
-    if _EXTENSION_API in filenames:
-      return under_api_path(_EXTENSION_API)
-    # API schema data could not be found in any .json or .idl file.
-    return None
+    filename = find_schema_under_path(api_name, CORE_API)
+    if filename is not None:
+      return filename
+    return find_schema_under_path(api_name, API)
 
   def _GetApiSchema(self, api_name, file_system, version):
     '''Searches |file_system| for |api_name|'s API schema data, and processes