Merge 59: [Android WebAPK] Don't navigate WebAPK as a result of WindowClient.focus()

Merge 59: [Android WebAPK] Don't navigate WebAPK as a result of WindowClient.focus()

This CL makes WindowClient.Focus() not navigate the WebAPK if the WebAPK is
already open.

When a user taps on a Twitter notification, the following race condition occurs:
- The service worker uses postMessage() and the main page navigates by setting
  window.location.href
- The service worker calls WindowClient.Focus(). This causes a navigation to
  the current page

This CL will remove the race by making WindowClient.Focus() not do any
navigation if the WebAPK is already running

BUG=711011
Review-Url: https://codereview.chromium.org/2849873002
Cr-Original-Commit-Position: refs/heads/master@{#472327}
Review-Url: https://codereview.chromium.org/2901013002 .
Cr-Commit-Position: refs/branch-heads/3071@{#671}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/157c3636e9b9cf67981e699ada98a03432056210

[pkotwicz, 2017-05-23 15:42:49]

Description was changed from

==========
Merge 59: [Android WebAPK] Don't navigate WebAPK as a result of
WindowClient.focus()

This CL makes WindowClient.Focus() not navigate the WebAPK if the WebAPK is
already open.

When a user taps on a Twitter notification, the following race condition occurs:
- The service worker uses postMessage() and the main page navigates by setting
  window.location.href
- The service worker calls WindowClient.Focus(). This causes a navigation to
  the current page

This CL will remove the race by making WindowClient.Focus() not do any
navigation if the WebAPK is already running

BUG=711011

Review-Url: https://codereview.chromium.org/2849873002
Cr-Commit-Position: refs/heads/master@{#472327}
(cherry picked from commit dcab9933793a5bb76c6627541211f86c20d6a5b2)
==========

to

==========
Merge 59: [Android WebAPK] Don't navigate WebAPK as a result of
WindowClient.focus()

This CL makes WindowClient.Focus() not navigate the WebAPK if the WebAPK is
already open.

When a user taps on a Twitter notification, the following race condition occurs:
- The service worker uses postMessage() and the main page navigates by setting
  window.location.href
- The service worker calls WindowClient.Focus(). This causes a navigation to
  the current page

This CL will remove the race by making WindowClient.Focus() not do any
navigation if the WebAPK is already running

BUG=711011

Review-Url: https://codereview.chromium.org/2849873002
Cr-Original-Commit-Position: refs/heads/master@{#472327}
Review-Url: https://codereview.chromium.org/2901013002 .
Cr-Commit-Position: refs/branch-heads/3071@{#671}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/157c3636e9b9cf67981e699ada98...
==========

[pkotwicz, 2017-05-23 15:42:51]

Committed patchset #1 (id:1) manually as
157c3636e9b9cf67981e699ada98a03432056210.