RN: Remove React Stack Systrace Logic

Reviewed By: sophiebits

Differential Revision: D7027263

fbshipit-source-id: f4eb3fab402eda337f464e4ebb0771202a9b93f2

Author: yungsters

Libraries/Core/InitializeCore.js

@@ -103,7 +103,7 @@ Object.defineProperty(global.process, 'argv',
 // Setup the Systrace profiling hooks if necessary
 if (global.__RCTProfileIsProfiling) {
   const Systrace = require('Systrace');
-  Systrace.installReactHook(true);
+  Systrace.installReactHook();
   Systrace.setEnabled(true);
 }
 

Libraries/Performance/Systrace.js

@@ -34,7 +34,6 @@ let _asyncCookie = 0;
 const _markStack = [];
 let _markStackIndex = -1;
 let _canInstallReactHook = false;
-let _useFiber = false;
 
 // Implements a subset of User Timing API necessary for React measurements.
 // https://developer.mozilla.org/en-US/docs/Web/API/User_Timing_API
@@ -100,54 +99,13 @@ const userTimingPolyfill = __DEV__ ? {
   },
 } : null;
 
-// A hook to get React Stack markers in Systrace.
-const reactDebugToolHook = __DEV__ ? {
-  onBeforeMountComponent(debugID) {
-    const ReactComponentTreeHook = require('ReactGlobalSharedState').ReactComponentTreeHook;
-    const displayName = ReactComponentTreeHook.getDisplayName(debugID);
-    Systrace.beginEvent(`ReactReconciler.mountComponent(${displayName})`);
-  },
-  onMountComponent(debugID) {
-    Systrace.endEvent();
-  },
-  onBeforeUpdateComponent(debugID) {
-    const ReactComponentTreeHook = require('ReactGlobalSharedState').ReactComponentTreeHook;
-    const displayName = ReactComponentTreeHook.getDisplayName(debugID);
-    Systrace.beginEvent(`ReactReconciler.updateComponent(${displayName})`);
-  },
-  onUpdateComponent(debugID) {
-    Systrace.endEvent();
-  },
-  onBeforeUnmountComponent(debugID) {
-    const ReactComponentTreeHook = require('ReactGlobalSharedState').ReactComponentTreeHook;
-    const displayName = ReactComponentTreeHook.getDisplayName(debugID);
-    Systrace.beginEvent(`ReactReconciler.unmountComponent(${displayName})`);
-  },
-  onUnmountComponent(debugID) {
-    Systrace.endEvent();
-  },
-  onBeginLifeCycleTimer(debugID, timerType) {
-    const ReactComponentTreeHook = require('ReactGlobalSharedState').ReactComponentTreeHook;
-    const displayName = ReactComponentTreeHook.getDisplayName(debugID);
-    Systrace.beginEvent(`${displayName}.${timerType}()`);
-  },
-  onEndLifeCycleTimer(debugID, timerType) {
-    Systrace.endEvent();
-  },
-} : null;
-
 const Systrace = {
-  installReactHook(useFiber: boolean) {
+  installReactHook() {
     if (_enabled) {
       if (__DEV__) {
-        if (useFiber) {
-          global.performance = userTimingPolyfill;
-        } else {
-          require('ReactDebugTool').addHook(reactDebugToolHook);
-        }
+        global.performance = userTimingPolyfill;
       }
     }
-    _useFiber = useFiber;
     _canInstallReactHook = true;
   },
 
@@ -160,17 +118,8 @@ const Systrace = {
           global.nativeTraceEndLegacy && global.nativeTraceEndLegacy(TRACE_TAG_JS_VM_CALLS);
         }
         if (_canInstallReactHook) {
-          if (_useFiber) {
-            if (enabled && global.performance === undefined) {
-              global.performance = userTimingPolyfill;
-            }
-          } else {
-            const ReactDebugTool = require('ReactDebugTool');
-            if (enabled) {
-              ReactDebugTool.addHook(reactDebugToolHook);
-            } else {
-              ReactDebugTool.removeHook(reactDebugToolHook);
-            }
+          if (enabled && global.performance === undefined) {
+            global.performance = userTimingPolyfill;
           }
         }
       }
@@ -242,7 +191,7 @@ const Systrace = {
   attachToRelayProfiler(relayProfiler: RelayProfiler) {
     relayProfiler.attachProfileHandler('*', (name, state?) => {
       if (state != null && state.queryName !== undefined) {
-        name += '_' + state.queryName
+        name += '_' + state.queryName;
       }
       const cookie = Systrace.beginAsyncEvent(name);
       return () => {