Closing via Android's < (back) button works.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4d72ec4ded66ff9ad99497f5895433bccd179716

commit 4d72ec4ded66ff9ad99497f5895433bccd179716
Author: rouslan <rouslan@chromium.org>
Date: Sat Aug 13 06:21:13 2016

Enable closing while processing payment.

This patch allows closing PaymentRequest UI via the [x] button while
waiting for merchant to process the payment. This is accomplished by
switching off the "is processing pay clicked" flag when
showProcessingMessage() has been called. PaymentRequestImpl calls
showProcessingMessage() when payment app has closed and its info has
been sent to the merchant website.

BUG= 637366 

Review-Url: https://codereview.chromium.org/2247493002
Cr-Commit-Position: refs/heads/master@{#411881}

[add] https://crrev.com/4d72ec4ded66ff9ad99497f5895433bccd179716/chrome/android/java/src/org/chromium/chrome/browser/payments/OWNERS
[modify] https://crrev.com/4d72ec4ded66ff9ad99497f5895433bccd179716/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
[modify] https://crrev.com/4d72ec4ded66ff9ad99497f5895433bccd179716/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java

Your change meets the bar and is auto-approved for M53 (branch: 2785)

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1a1d153e4ff3c681fb72a4290c575a52bdb6d2e9

commit 1a1d153e4ff3c681fb72a4290c575a52bdb6d2e9
Author: Rouslan Solomakhin <rouslan@chromium.org>
Date: Fri Aug 19 16:53:34 2016

[Merge M-53] Enable closing while processing payment.

This patch allows closing PaymentRequest UI via the [x] button while
waiting for merchant to process the payment. This is accomplished by
switching off the "is processing pay clicked" flag when
showProcessingMessage() has been called. PaymentRequestImpl calls
showProcessingMessage() when payment app has closed and its info has
been sent to the merchant website.

BUG= 637366 

Review-Url: https://codereview.chromium.org/2247493002
Cr-Commit-Position: refs/heads/master@{#411881}
(cherry picked from commit 4d72ec4ded66ff9ad99497f5895433bccd179716)

Review URL: https://codereview.chromium.org/2260503004 .

Cr-Commit-Position: refs/branch-heads/2785@{#679}
Cr-Branched-From: 68623971be0cfc492a2cb0427d7f478e7b214c24-refs/heads/master@{#403382}

[add] https://crrev.com/1a1d153e4ff3c681fb72a4290c575a52bdb6d2e9/chrome/android/java/src/org/chromium/chrome/browser/payments/OWNERS
[modify] https://crrev.com/1a1d153e4ff3c681fb72a4290c575a52bdb6d2e9/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
[modify] https://crrev.com/1a1d153e4ff3c681fb72a4290c575a52bdb6d2e9/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java

Verified in M53-53.0.2785.80 build