trace_processor: Add a helper for finding Chrome processes and threads

Usage: SELECT RUN_METRIC("chrome/chrome_processes.sql");

Bug: 152840173
Change-Id: Iff270e01172be2ead08c6e934fe2a6aab84fe23d
diff --git a/Android.bp b/Android.bp
index fa38157..7609f8e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -49,6 +49,7 @@
     "src/trace_processor/metrics/android/unmapped_java_symbols.sql",
     "src/trace_processor/metrics/android/unsymbolized_frames.sql",
     "src/trace_processor/metrics/android/upid_span_view.sql",
+    "src/trace_processor/metrics/chrome/chrome_processes.sql",
     "src/trace_processor/metrics/trace_metadata.sql",
   ],
   cmd: "$(location tools/gen_merged_sql_metrics.py) --cpp_out=$(out) $(in)",