Add Startup.BrowserView.FirstPaint / .CompositingEnded histograms.

chrome/browser/ui/cocoa/browser_window_cocoa.mm

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/cocoa/browser_window_cocoa.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #import "base/mac/sdk_forward_declarations.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/extensions/tab_helper.h"
+#include "chrome/browser/metrics/browser_window_histogram_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_window.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/browser/signin/chrome_signin_helper.h"
 #include "chrome/browser/translate/chrome_translate_client.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_command_controller.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 139 matching lines @@
     saved_animation_behavior = [window() animationBehavior];
     [window() setAnimationBehavior:NSWindowAnimationBehaviorNone];
   }
 
   {
     TRACE_EVENT0("ui", "BrowserWindowCocoa::Show makeKeyAndOrderFront");
     // This call takes up a substantial part of startup time, and an even more
     // substantial part of startup time when any CALayers are part of the
     // window's NSView heirarchy.
     [window() makeKeyAndOrderFront:controller_];
+
+    // At this point all the Browser's UI is painted on the screen. There's no
+    // need to wait for the compositor, so pass the nullptr instead and don't
+    // store the returned instance.
+    BrowserWindowHistogramHelper::
+        MaybeRecordValueAndCreateInstanceOnBrowserPaint(nullptr);
   }
 
   // When creating windows from nibs it is necessary to |makeKeyAndOrderFront:|
   // prior to |orderOut:| then |miniaturize:| when restoring windows in the
   // minimized state.
   if (initial_show_state_ == ui::SHOW_STATE_MINIMIZED) {
     [window() orderOut:controller_];
     [window() miniaturize:controller_];
   } else if (initial_show_state_ == ui::SHOW_STATE_FULLSCREEN) {
     chrome::ToggleFullscreenMode(browser_);
@@ skipping 663 matching lines @@
 ExclusiveAccessContext* BrowserWindowCocoa::GetExclusiveAccessContext() {
   return [controller_ exclusiveAccessController];
 }
 
 void BrowserWindowCocoa::ShowImeWarningBubble(
     const extensions::Extension* extension,
     const base::Callback<void(ImeWarningBubblePermissionStatus status)>&
         callback) {
   NOTREACHED() << "The IME warning bubble is unsupported on this platform.";
 }