[Blink] Update Buganizer GetIssueList API response parsing

GetIssueList request return list of issue in the same structure as the
payload returned from CreateIssue [1], so it should be parsed the same
way before returning to the caller.

[1]: http://google3/google/devtools/issuetracker/v1/issuetracker_service.proto;l=1814;rcl=623266776

Change-Id: I5e01e8ab761745811f9b423baf6c35658796ce21
Bug: 335457566
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5501448
Reviewed-by: Jonathan Lee <jonathanjlee@google.com>
Reviewed-by: Weizhong Xia <weizhong@google.com>
Commit-Queue: An Sung <ansung@google.com>
Cr-Commit-Position: refs/heads/main@{#1294923}
diff --git a/third_party/blink/tools/blinkpy/w3c/buganizer.py b/third_party/blink/tools/blinkpy/w3c/buganizer.py
index a03d21b..a82dd1f14 100644
--- a/third_party/blink/tools/blinkpy/w3c/buganizer.py
+++ b/third_party/blink/tools/blinkpy/w3c/buganizer.py
@@ -163,7 +163,9 @@
                           'error: %s', str(e))
             return {'error': str(e)}
 
-    def GetIssueList(self, query_string, limit: int = MAX_PAGE_SIZE):
+    def GetIssueList(self,
+                     query_string,
+                     limit: int = MAX_PAGE_SIZE) -> List[BuganizerIssue]:
         """Makes a request to the issue tracker to get list of issues by query"""
         # TODO(crbug.com/333112144) : Use nextPageToken in response to support
         # more than 500 issues
@@ -173,7 +175,14 @@
                                               view='FULL')
         try:
             response = self._ExecuteRequest(request)
-            issues = response.get('issues', []) if response else []
+            logging.debug('[BuganizerClient] GetIssueList response: %s',
+                          response)
+            if not response:
+                return []
+            issues = [
+                BuganizerIssue.from_payload(issue_payload)
+                for issue_payload in response.get('issues', [])
+            ]
             return issues
         except Exception as e:
             raise BuganizerError(f'failed to get issue list: {e}') from e