Launch an external app when Chrome cannot handle the URL

Launch an external app when Chrome cannot handle the URL

When some third-party app launched Chrome with an intent, and the URL
got redirected to another, we try to stay in Chroem unless there is a new
intent handler after redirection. The rationale here is that the user has
explicitly chosen Chrome over other intent handlers already, and we do not
want to bother them any more.

However, if the new URL is actually an external protocol, then Chrome
cannot handle it anyways. This CL fixes stay-in-Chrome logic and adds a
test case.

BUG=598546
Review URL: https://codereview.chromium.org/1855853002

Cr-Commit-Position: refs/heads/master@{#385350}
(cherry picked from commit 54b7bc3dea8ab099971559538b9ffc50c79f6d8e)

Committed: https://chromium.googlesource.com/chromium/src/+/76012c7276fc5734c9691674aed8a60001b53ca8

[Changwan Ryu, 2016-04-07 02:27:59]

Description was changed from

==========
Launch an external app when Chrome cannot handle the URL

When some third-party app launched Chrome with an intent, and the URL
got redirected to another, we try to stay in Chroem unless there is a new
intent handler after redirection. The rationale here is that the user has
explicitly chosen Chrome over other intent handlers already, and we do not
want to bother them any more.

However, if the new URL is actually an external protocol, then Chrome
cannot handle it anyways. This CL fixes stay-in-Chrome logic and adds a
test case.

BUG=598546

Review URL: https://codereview.chromium.org/1855853002

Cr-Commit-Position: refs/heads/master@{#385350}
(cherry picked from commit 54b7bc3dea8ab099971559538b9ffc50c79f6d8e)
==========

to

==========
Launch an external app when Chrome cannot handle the URL

When some third-party app launched Chrome with an intent, and the URL
got redirected to another, we try to stay in Chroem unless there is a new
intent handler after redirection. The rationale here is that the user has
explicitly chosen Chrome over other intent handlers already, and we do not
want to bother them any more.

However, if the new URL is actually an external protocol, then Chrome
cannot handle it anyways. This CL fixes stay-in-Chrome logic and adds a
test case.

BUG=598546

Review URL: https://codereview.chromium.org/1855853002

Cr-Commit-Position: refs/heads/master@{#385350}
(cherry picked from commit 54b7bc3dea8ab099971559538b9ffc50c79f6d8e)

Committed:
https://chromium.googlesource.com/chromium/src/+/76012c7276fc5734c9691674aed8...
==========

[Changwan Ryu, 2016-04-07 02:28:01]

Committed patchset #1 (id:1) manually as
76012c7276fc5734c9691674aed8a60001b53ca8.