SF TimeStats: add global present to present histogram

Bug: b/79872109
Test: dumpsys SurfaceFlinger --timestats <options>
Change-Id: Iab8c01d66c69a04a89f7e9313e53ff961ce0175c
diff --git a/services/surfaceflinger/TimeStats/timestatsproto/TimeStatsHelper.cpp b/services/surfaceflinger/TimeStats/timestatsproto/TimeStatsHelper.cpp
index ec41a62..c701224 100644
--- a/services/surfaceflinger/TimeStats/timestatsproto/TimeStatsHelper.cpp
+++ b/services/surfaceflinger/TimeStats/timestatsproto/TimeStatsHelper.cpp
@@ -93,6 +93,8 @@
     StringAppendF(&result, "missedFrames = %d\n", missedFrames);
     StringAppendF(&result, "clientCompositionFrames = %d\n", clientCompositionFrames);
     StringAppendF(&result, "displayOnTime = %lld ms\n", static_cast<long long int>(displayOnTime));
+    StringAppendF(&result, "presentToPresent histogram is as below:\n");
+    result.append(presentToPresent.toString());
     const auto dumpStats = generateDumpStats(maxLayers);
     for (const auto& ele : dumpStats) {
         result.append(ele->toString());
@@ -128,6 +130,11 @@
     globalProto.set_missed_frames(missedFrames);
     globalProto.set_client_composition_frames(clientCompositionFrames);
     globalProto.set_display_on_time(displayOnTime);
+    for (const auto& histEle : presentToPresent.hist) {
+        SFTimeStatsHistogramBucketProto* histProto = globalProto.add_present_to_present();
+        histProto->set_time_millis(histEle.first);
+        histProto->set_frame_count(histEle.second);
+    }
     const auto dumpStats = generateDumpStats(maxLayers);
     for (const auto& ele : dumpStats) {
         SFTimeStatsLayerProto* layerProto = globalProto.add_stats();