Add Startup.BrowserView.FirstPaint / .CompositingEnded histograms.

chrome/browser/ui/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 691 matching lines @@
       "browser_tab_strip_model_delegate.h",
       "browser_tab_strip_tracker.cc",
       "browser_tab_strip_tracker.h",
       "browser_tab_strip_tracker_delegate.h",
       "browser_tabrestore.cc",
       "browser_tabrestore.h",
       "browser_tabstrip.cc",
       "browser_tabstrip.h",
       "browser_toolbar_model_delegate.cc",
       "browser_toolbar_model_delegate.h",
+      "browser_view_histogram_helper.cc",
+      "browser_view_histogram_helper.h",
       "browser_view_prefs.cc",
       "browser_view_prefs.h",
       "browser_window_state.cc",
       "browser_window_state.h",
       "chrome_bubble_manager.cc",
       "chrome_bubble_manager.h",
       "chrome_pages.cc",
       "chrome_pages.h",
       "chrome_web_modal_dialog_manager_delegate.cc",
       "chrome_web_modal_dialog_manager_delegate.h",
@@ skipping 2830 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }