Hey Jinsuk, it looks like your recent CL is causing failures on "Android N5X Swarm Builder". Could you please take a look?

Builders failed on: 
- Android N5X Swarm Builder: 
  https://build.chromium.org/p/chromium.android/builders/Android%20N5X%20Swarm%20Builder

Example fail:
https://build.chromium.org/p/chromium.android/builders/Android%20N5X%20Swarm%20Builder/builds/12168

ViewAndroidTest.ChecksMultipleEventForwarders fails with:

[ RUN      ] ViewAndroidTest.ChecksMultipleEventForwarders
[WARNING] ../../third_party/googletest/src/googletest/src/gtest-death-test.cc:836:: Death tests use fork(), which is unsafe particularly in a threaded context. For this test, Google Test detected 11 threads.
../../ui/android/view_android_unittests.cc:174: Failure
Death test: parent.AddChild(&child)
    Result: failed to die.
 Error msg:
[  DEATH   ]

This test was added in https://codereview.chromium.org/2861413002.