The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/36d0286404018e441692f66d1289f33ff33a05d1

commit 36d0286404018e441692f66d1289f33ff33a05d1
Author: sunjian <sunjian@chromium.org>
Date: Fri Mar 17 20:11:49 2017

Report nav timing 2 instance as soon as it's requested.

Currently NT2 instance is not available until loadEventEnd happens. However,
this new feature contradicts with the way current clients use NT1 which is available
as soon as it gets requested. In order to align with NT1's usage behavior, we
need to also make NT2 available as soon as clients request for it.

Doc: https://docs.google.com/a/chromium.org/document/d/1QX2zVcYpuFTsq0MEZH9J8ZUT4CCBezXKE--eX2ctOhw/edit?usp=sharing

BUG= 687398 

Review-Url: https://codereview.chromium.org/2647643004
Cr-Commit-Position: refs/heads/master@{#457871}

[add] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/LayoutTests/external/wpt/navigation-timing/nav2_test_instance_accessible_from_the_start.html
[delete] https://crrev.com/f00e8b48a63cdac2e5d21fe63581bb488c3a355f/third_party/WebKit/LayoutTests/external/wpt/navigation-timing/nav2_test_open_blank_page.html
[delete] https://crrev.com/f00e8b48a63cdac2e5d21fe63581bb488c3a355f/third_party/WebKit/LayoutTests/external/wpt/navigation-timing/nav2_test_open_data_uri.html
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/Performance.cpp
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/Performance.h
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/PerformanceBase.h
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/PerformanceBaseTest.cpp
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/PerformanceEntry.h
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/PerformanceNavigationTiming.cpp
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/PerformanceNavigationTiming.h
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.cpp
[modify] https://crrev.com/36d0286404018e441692f66d1289f33ff33a05d1/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.h