Track the time spent in source and output-tree diff checking.

PiperOrigin-RevId: 233971847
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java b/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java
index 6c7a4d7..f906215 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java
@@ -20,7 +20,6 @@
 import com.google.devtools.build.lib.actions.ActionKeyContext;
 import com.google.devtools.build.lib.actions.ActionResultReceivedEvent;
 import com.google.devtools.build.lib.buildtool.BuildRequest;
-import com.google.devtools.build.lib.buildtool.ExecutionFinishedEvent;
 import com.google.devtools.build.lib.buildtool.buildevent.BuildCompleteEvent;
 import com.google.devtools.build.lib.buildtool.buildevent.ExecutionStartingEvent;
 import com.google.devtools.build.lib.clock.BlazeClock;
@@ -31,6 +30,7 @@
 import com.google.devtools.build.lib.profiler.Profiler;
 import com.google.devtools.build.lib.profiler.ProfilerTask;
 import com.google.devtools.build.lib.profiler.SilentCloseable;
+import com.google.devtools.build.lib.skyframe.ExecutionFinishedEvent;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;