add GCS support to docs server

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

Index: chrome/common/extensions/docs/server2/server_instance.py
diff --git a/chrome/common/extensions/docs/server2/server_instance.py b/chrome/common/extensions/docs/server2/server_instance.py
index 7dd7db07d4d2bb7e37e7dd68114d0bb7473d9e54..1ac82abdc830963443f2175c2da52466529a3c91 100644
--- a/chrome/common/extensions/docs/server2/server_instance.py
+++ b/chrome/common/extensions/docs/server2/server_instance.py
@@ -14,8 +14,8 @@ from empty_dir_file_system import EmptyDirFileSystem
 from environment import IsDevServer
 from features_bundle import FeaturesBundle
 from github_file_system_provider import GithubFileSystemProvider
-from host_file_system_provider import HostFileSystemProvider
 from host_file_system_iterator import HostFileSystemIterator
+from host_file_system_provider import HostFileSystemProvider
 from object_store_creator import ObjectStoreCreator
 from path_canonicalizer import PathCanonicalizer
 from reference_resolver import ReferenceResolver
@@ -24,6 +24,7 @@ from table_of_contents_renderer import TableOfContentsRenderer
 from template_renderer import TemplateRenderer
 from test_branch_utility import TestBranchUtility
 from test_object_store import TestObjectStore
+from gcs_file_system_provider import CloudStorageFileSystemProvider
 
 
 class ServerInstance(object):
@@ -34,6 +35,7 @@ class ServerInstance(object):
                branch_utility,
                host_file_system_provider,
                github_file_system_provider,
+               gcs_file_system_provider,
                base_path='/'):
     '''
     |object_store_creator|
@@ -62,6 +64,7 @@ class ServerInstance(object):
     host_fs_at_trunk = host_file_system_provider.GetTrunk()
 
     self.github_file_system_provider = github_file_system_provider
+    self.gcs_file_system_provider = gcs_file_system_provider
 
     assert base_path.startswith('/') and base_path.endswith('/')
     self.base_path = base_path
@@ -141,7 +144,8 @@ class ServerInstance(object):
     self.content_providers = ContentProviders(
         self.compiled_fs_factory,
         host_fs_at_trunk,
-        self.github_file_system_provider)
+        self.github_file_system_provider,
+        self.gcs_file_system_provider)
 
     # TODO(kalman): Move all the remaining DataSources into DataSourceRegistry,
     # then factor out the DataSource creation into a factory method, so that
@@ -174,6 +178,7 @@ class ServerInstance(object):
                           TestBranchUtility.CreateWithCannedData(),
                           file_system_provider,
                           GithubFileSystemProvider.ForEmpty(),
+                          CloudStorageFileSystemProvider(object_store_creator),
                           base_path=base_path)
 
   @staticmethod
@@ -187,4 +192,5 @@ class ServerInstance(object):
         CompiledFileSystem.Factory(object_store_creator),
         TestBranchUtility.CreateWithCannedData(),
         host_file_system_provider,
-        GithubFileSystemProvider.ForEmpty())
+        GithubFileSystemProvider.ForEmpty(),
+        CloudStorageFileSystemProvider(object_store_creator))