The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3b669c732833d94c9b84974af7cf1b00eaeb0f32

commit 3b669c732833d94c9b84974af7cf1b00eaeb0f32
Author: csashi <csashi@google.com>
Date: Fri Apr 28 03:04:56 2017

Logs different SaveCardPrompt histogram names depending on if user
accepted previous save card prompt.

BUG= 715617 

Review-Url: https://codereview.chromium.org/2839683002
Cr-Commit-Position: refs/heads/master@{#467864}

[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/chrome/browser/autofill/autofill_save_card_infobar_delegate_mobile_unittest.cc
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/chrome/browser/ui/autofill/chrome_autofill_client.cc
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/chrome/browser/ui/autofill/save_card_bubble_controller_impl.h
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/chrome/browser/ui/autofill/save_card_bubble_controller_impl_unittest.cc
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/components/autofill/core/browser/autofill_manager.cc
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/components/autofill/core/browser/autofill_metrics.cc
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/components/autofill/core/browser/autofill_metrics.h
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/components/autofill/core/browser/autofill_save_card_infobar_delegate_mobile.cc
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/components/autofill/core/browser/autofill_save_card_infobar_delegate_mobile.h
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/components/autofill/core/common/autofill_pref_names.cc
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/components/autofill/core/common/autofill_pref_names.h
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/ios/chrome/browser/ui/autofill/autofill_client_ios.mm
[modify] https://crrev.com/3b669c732833d94c9b84974af7cf1b00eaeb0f32/tools/metrics/histograms/histograms.xml