blimp: Update page load status update indicator to use first paint.

blimp/engine/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/repack.gni")
@@ skipping 290 matching lines @@
     "//third_party/libwebp",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 }
 
 source_set("session") {
   sources = [
     "session/blimp_engine_session.cc",
     "session/blimp_engine_session.h",
+    "session/page_load_tracker.cc",
+    "session/page_load_tracker.h",
   ]
 
   deps = [
     ":app_config",
     ":app_settings",
     ":app_switches",
     ":app_ui",
     ":common",
     ":feature",
     "//base",
@@ skipping 275 matching lines @@
       # Include symupload target here as it is needed by the buildbots to upload
       # the symbol file created by dump_syms.
       deps = [
         ":blimp_engine_app",
         "//breakpad:symupload",
         dump_syms_label,
       ]
     }
   }
 }