added metrics for snapshot

Reviewed By: lblasa

Differential Revision: D39886448

fbshipit-source-id: b229f6947d199026c6e4bdc89def6ac0a0fa9d0a

android/src/main/java/com/facebook/flipper/plugins/uidebugger/core/NativeScanScheduler.kt

@@ -66,6 +66,7 @@ class NativeScanScheduler(val context: Context) : Scheduler.Task<ScanResult> {
                 input.txId,
                 "FullScan",
                 input.scanStart,
+                input.scanStart,
                 input.scanEnd,
                 input.scanEnd,
                 serializationEnd,

android/src/main/java/com/facebook/flipper/plugins/uidebugger/model/Events.kt

@@ -43,6 +43,7 @@ data class PerfStatsEvent(
     val observerType: String,
     val start: Long,
     val traversalComplete: Long,
+    val snapshotComplete: Long,
     val queuingComplete: Long,
     val serializationComplete: Long,
     val socketComplete: Long,

android/src/main/java/com/facebook/flipper/plugins/uidebugger/observers/TreeObserver.kt

@@ -81,6 +81,8 @@ abstract class TreeObserver<T> {
 
     Log.d(LogTag, "For Observer ${this.type} Sending ${visitedNodes.size}")
 
+    val traversalCompleteTime = System.currentTimeMillis()
+
     if (snapshotBitmap != null) {
       @Suppress("unchecked_cast")
       val descriptor =
@@ -89,10 +91,17 @@ abstract class TreeObserver<T> {
       descriptor.getSnapshot(root, snapshotBitmap.bitmap)
     }
 
-    val endTimestamp = System.currentTimeMillis()
+    val snapshotCompleteTime = System.currentTimeMillis()
+
     context.treeObserverManager.enqueueUpdate(
         SubtreeUpdate(
-            type, root.nodeId(), visitedNodes, startTimestamp, endTimestamp, snapshotBitmap))
+            type,
+            root.nodeId(),
+            visitedNodes,
+            startTimestamp,
+            traversalCompleteTime,
+            snapshotCompleteTime,
+            snapshotBitmap))
   }
 
   fun cleanUpRecursive() {

android/src/main/java/com/facebook/flipper/plugins/uidebugger/observers/TreeObserverManager.kt

@@ -31,6 +31,7 @@ data class SubtreeUpdate(
     val nodes: List<Node>,
     val startTime: Long,
     val traversalCompleteTime: Long,
+    val snapshotComplete: Long,
     val snapshot: BitmapPool.ReusableBitmap?
 )
 
@@ -104,6 +105,7 @@ class TreeObserverManager(val context: Context) {
                       observerType = treeUpdate.observerType,
                       start = treeUpdate.startTime,
                       traversalComplete = treeUpdate.traversalCompleteTime,
+                      snapshotComplete = treeUpdate.snapshotComplete,
                       queuingComplete = onWorkerThread,
                       serializationComplete = serializationEnd,
                       socketComplete = socketEnd,