[PM] Add official mocks for all node types

Change-Id: I54e92cc9edd075a4e9de2312466501be571bc8b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6090195
Commit-Queue: Patrick Monette <[email protected]>
Reviewed-by: Joe Mason <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1395758}
diff --git a/components/performance_manager/test_support/BUILD.gn b/components/performance_manager/test_support/BUILD.gn
index de8d7bed..6628701 100644
--- a/components/performance_manager/test_support/BUILD.gn
+++ b/components/performance_manager/test_support/BUILD.gn
@@ -45,6 +45,16 @@
   testonly = true
 
   sources = [
+    "graph/mock_frame_node_observer.cc",
+    "graph/mock_frame_node_observer.h",
+    "graph/mock_page_node_observer.cc",
+    "graph/mock_page_node_observer.h",
+    "graph/mock_process_node_observer.cc",
+    "graph/mock_process_node_observer.h",
+    "graph/mock_system_node_observer.cc",
+    "graph/mock_system_node_observer.h",
+    "graph/mock_worker_node_observer.cc",
+    "graph/mock_worker_node_observer.h",
     "graph_test_harness.cc",
     "graph_test_harness.h",
     "mock_graphs.cc",