Reland of Separate deferred startup into tasks.

chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser;
 
 import android.app.Activity;
 import android.app.ActivityManager;
 import android.content.Context;
 import android.content.Intent;
@@ skipping 958 matching lines @@
         mHandler.post(new Runnable() {
             @Override
             public void run() {
                 startActivityForResult(freIntent, FIRST_RUN_EXPERIENCE_RESULT);
             }
         });
     }
 
     @Override
     protected void onDeferredStartup() {
-        try {
-            TraceEvent.begin("ChromeTabbedActivity.onDeferredStartup");
-            super.onDeferredStartup();
+        super.onDeferredStartup();
+        DeferredStartupHandler.getInstance().addDeferredTask(new Runnable() {
+            @Override
+            public void run() {
+                ActivityManager am =
+                        (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
+                RecordHistogram.recordSparseSlowlyHistogram(
+                        "MemoryAndroid.DeviceMemoryClass", am.getMemoryClass());
 
-            ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
-            RecordHistogram.recordSparseSlowlyHistogram(
-                    "MemoryAndroid.DeviceMemoryClass", am.getMemoryClass());
-
-            AutocompleteController.nativePrefetchZeroSuggestResults();
-        } finally {
-            TraceEvent.end("ChromeTabbedActivity.onDeferredStartup");
-        }
+                AutocompleteController.nativePrefetchZeroSuggestResults();
+            }
+        });
     }
 
     private void createTabModelSelectorImpl(Bundle savedInstanceState) {
         // We determine the model as soon as possible so every systems get initialized coherently.
         boolean startIncognito = savedInstanceState != null
                 && savedInstanceState.getBoolean("is_incognito_selected", false);
         int index = savedInstanceState != null ? savedInstanceState.getInt(WINDOW_INDEX, 0) : 0;
         mTabModelSelectorImpl = (TabModelSelectorImpl)
                 TabWindowManager.getInstance().requestSelector(this, getWindowAndroid(), index);
         if (mTabModelSelectorImpl == null) {
@@ skipping 540 matching lines @@
             }
             // 3. Kill the other activity's task to remove it from Android recents.
             otherActivityTask.finishAndRemoveTask();
         }
 
         // 4. Ask TabPersistentStore to merge state.
         RecordUserAction.record("Android.MergeState.Live");
         mTabModelSelectorImpl.mergeState();
     }
 }