Add ViewCapure perfetto data source (Winscope traces)

Bug: 323166383
Test: presubmit
Change-Id: I23ec0baeef4ae423b5d88c5cf08d21fc57b14bfc
diff --git a/src_common/com/android/traceur/PerfettoUtils.java b/src_common/com/android/traceur/PerfettoUtils.java
index 5d3949e..2dc78eb 100644
--- a/src_common/com/android/traceur/PerfettoUtils.java
+++ b/src_common/com/android/traceur/PerfettoUtils.java
@@ -696,6 +696,13 @@
                 .append("    }\n")
                 .append("  }\n")
                 .append("}\n");
+
+            config.append("data_sources: {\n")
+                .append("  config {\n")
+                .append("    name: \"android.viewcapture\"\n")
+                .append("    target_buffer: " + targetBuffer + "\n")
+                .append("  }\n")
+                .append("}\n");
         }
     }
 }