The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/73b7f2fce6f5ef21212bb6482fd5cfa7ec9344f6

commit 73b7f2fce6f5ef21212bb6482fd5cfa7ec9344f6
Author: cco3 <cco3@chromium.org>
Date: Tue Mar 21 00:34:47 2017

Add PhysicalWeb.updateScans()

This updateScans method simplifies the environment checks needed before
beginning or ending a scan.  Instead of each code path that may begin
or end a scan checking permissions by itself, based on what event has
just occurred, this method will check and update scans as needed.

This paves the way for an upgraded scanning API that will let client
code to the Physical Web request different scan policies.  On each
request, we will be able to simply call updateScans().

BUG= 703308 

Review-Url: https://codereview.chromium.org/2762733002
Cr-Commit-Position: refs/heads/master@{#458254}

[modify] https://crrev.com/73b7f2fce6f5ef21212bb6482fd5cfa7ec9344f6/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWeb.java
[modify] https://crrev.com/73b7f2fce6f5ef21212bb6482fd5cfa7ec9344f6/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/PhysicalWebPreferenceFragment.java
[modify] https://crrev.com/73b7f2fce6f5ef21212bb6482fd5cfa7ec9344f6/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/PrivacyPreferencesManager.java

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1c16fca164db734cdafd0a428423392dbd3a93ab

commit 1c16fca164db734cdafd0a428423392dbd3a93ab
Author: cco3 <cco3@chromium.org>
Date: Fri Mar 24 19:09:53 2017

Associate a scan mode with Physical Web listeners

Instead of having a blanket scanning policy, it would be nice if client
code could specify the kind of scan required.

This change lets Physical Web listeners specify a scan mode when they
register.  This mode is recorded, but not currently used.  A followup
CL will surface this to the platform layer where Android/iOS can use it
appropriately.

BUG= 703308 

Review-Url: https://codereview.chromium.org/2765713002
Cr-Commit-Position: refs/heads/master@{#459507}

[modify] https://crrev.com/1c16fca164db734cdafd0a428423392dbd3a93ab/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
[modify] https://crrev.com/1c16fca164db734cdafd0a428423392dbd3a93ab/components/physical_web/data_source/fake_physical_web_data_source.cc
[modify] https://crrev.com/1c16fca164db734cdafd0a428423392dbd3a93ab/components/physical_web/data_source/fake_physical_web_data_source.h
[modify] https://crrev.com/1c16fca164db734cdafd0a428423392dbd3a93ab/components/physical_web/data_source/physical_web_data_source.h
[modify] https://crrev.com/1c16fca164db734cdafd0a428423392dbd3a93ab/components/physical_web/data_source/physical_web_data_source_impl.cc
[modify] https://crrev.com/1c16fca164db734cdafd0a428423392dbd3a93ab/components/physical_web/data_source/physical_web_data_source_impl.h
[modify] https://crrev.com/1c16fca164db734cdafd0a428423392dbd3a93ab/components/physical_web/data_source/physical_web_data_source_impl_unittest.cc