gitiles: support the b= argument for repository listing.

Change-Id: Ic0b72d1ad7e56439fe4fae2e656f589d6d7a32a3

gitiles/client.go

diff --git a/gitiles/client.go b/gitiles/client.go
index 27a04fd..86845e3 100644
--- a/gitiles/client.go
+++ b/gitiles/client.go
@@ -116,9 +116,12 @@
 }
 
 // List retrieves the list of projects.
-func (s *Service) List() (map[string]*Project, error) {
+func (s *Service) List(branches []string) (map[string]*Project, error) {
 	listURL := s.addr
 	listURL.RawQuery = "format=JSON"
+	for _, b := range branches {
+		listURL.RawQuery += "&b=" + b
+	}
 
 	projects := map[string]*Project{}
 	err := s.getJSON(&listURL, &projects)

gitiles/types.go

diff --git a/gitiles/types.go b/gitiles/types.go
index 99f29fa..b10ecbc 100644
--- a/gitiles/types.go
+++ b/gitiles/types.go
@@ -17,8 +17,10 @@
 import "fmt"
 
 type Project struct {
-	Name     string
-	CloneURL string `json:"clone_url"`
+	Name        string
+	CloneURL    string            `json:"clone_url"`
+	Description string            `json:"description"`
+	Branches    map[string]string `json:"branches"`
 }
 
 type Person struct {

gitiles/types_test.go

diff --git a/gitiles/types_test.go b/gitiles/types_test.go
index 5bb9845..26d4c2a 100644
--- a/gitiles/types_test.go
+++ b/gitiles/types_test.go
@@ -236,17 +236,27 @@
 		},
 		{
 			in: `{
-  "accessories/manifest": {
-    "name": "accessories/manifest",
-    "clone_url": "https://android.googlesource.com/accessories/manifest"
+   "plugins/oauth": {
+    "name": "plugins/oauth",
+    "clone_url": "https://gerrit.googlesource.com/plugins/oauth",
+    "description": "OAuth provider for GitHub and Google",
+    "branches": {
+      "master": "56fbd4c28ba35877a38ec4c6bbfc6b5920db4207",
+      "stable-2.10": "5d404e6c38ff380a3b8964c1343fb91b8ec6bb76"
+    }
   }
 }
 `,
 			want: &map[string]*Project{
-				"accessories/manifest": &Project{
-					Name:     "accessories/manifest",
-					CloneURL: "https://android.googlesource.com/accessories/manifest",
-				}},
+				"plugins/oauth": &Project{
+					Name:        "plugins/oauth",
+					CloneURL:    "https://gerrit.googlesource.com/plugins/oauth",
+					Description: "OAuth provider for GitHub and Google",
+					Branches: map[string]string{
+						"master":      "56fbd4c28ba35877a38ec4c6bbfc6b5920db4207",
+						"stable-2.10": "5d404e6c38ff380a3b8964c1343fb91b8ec6bb76",
+					}},
+			},
 			got: &map[string]*Project{},
 		},
 	}