Log RCTPLTTI for Warm Start

Reviewed By: javache

Differential Revision: D4962773

fbshipit-source-id: d01f8fe0d4e2f1e7453df03f9a15482f2f065a13

React/Base/RCTRootView.m

@@ -19,13 +19,14 @@
 #import "RCTEventDispatcher.h"
 #import "RCTKeyCommands.h"
 #import "RCTLog.h"
+#import "RCTPerformanceLogger.h"
+#import "RCTProfile.h"
+#import "RCTRootContentView.h"
 #import "RCTTouchHandler.h"
 #import "RCTUIManager.h"
 #import "RCTUtils.h"
 #import "RCTView.h"
-#import "RCTRootContentView.h"
 #import "UIView+React.h"
-#import "RCTProfile.h"
 
 #if TARGET_OS_TV
 #import "RCTTVRemoteHandler.h"
@@ -59,6 +60,9 @@ NSString *const RCTContentDidAppearNotification = @"RCTContentDidAppearNotificat
   RCTAssert(moduleName, @"A moduleName is required to create an RCTRootView");
 
   RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"-[RCTRootView init]", nil);
+  if (!bridge.isLoading) {
+    [bridge.performanceLogger markStartForTag:RCTPLTTI];
+  }
 
   if (self = [super initWithFrame:CGRectZero]) {
     self.backgroundColor = [UIColor whiteColor];

React/Profiler/RCTPerfMonitor.m

@@ -498,10 +498,12 @@ RCT_EXPORT_MODULE()
 
 - (void)tap
 {
+  [self loadPerformanceLoggerData];
   if (CGRectIsEmpty(_storedMonitorFrame)) {
     _storedMonitorFrame = CGRectMake(0, 20, self.container.window.frame.size.width, RCTPerfMonitorExpandHeight);
     [self.container addSubview:self.metrics];
-    [self loadPerformanceLoggerData];
+  } else {
+    [_metrics reloadData];
   }
 
   [UIView animateWithDuration:.25 animations:^{