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Step 3

Bug: 5306641
Change-Id: Ida4ccf181942714799576fde0ac55596ce043434

Bug: 4975279
Change-Id: I8e36dd6ce6f0e6a7859af00e7980e636933140fb

Fragmentized some of the activities and moved buttons into the menu area.

Bug: 3148844

Split the screen into 2 fragments.

Bug: 3148480

- Updated proguard.flags

Change-Id: I198761b0f0ad5288c8c807a7a3c2e965731fcee5

Change-Id: I0c3d6a358d0236893aba7257537ec32bfad4170d

Bug: 3140836

Add UserLeaveHintListener.java, so that the settings won't use
its implementation around Activity#onUserLeaveHint().

Also fragmentize bluetooth tethering screen.

Change-Id: Id06ae3161fbdb5854ddb7a257f464fb16ea9b089

* Add WifiSettingsForSetupWizardXL as a new Activity
The activity has WifiSettings fragment in it. It also contains
several buttons, texts around the fragment.

* Making configuration UI part of Preference list.
In Wifi Setup for Setup Wizard XL, WifiSettings fragment lets
a UI for configuring access points shown inside a
PregerenceCategory object, while it has been shown as Dialog.

To achieve this action, WifiDialog is decomposed into two parts:
- WifiConfigUiBase (Mainly UI part)
- WifiConfigController (Mainly Wifi controller part)

All codes for wifi configuration in WifiDialog is now in
WifiConfigController, which is reused from
WifiConfigPreference.

* Misc stuff
- Remove AccessPoint#compareTo(). Instead,
  AccessPoint.AccessPointComparater should be used when needed.

Change-Id: I520d690d3301837d32f91dad54a973a379ce1989

The logic calling selectFirst() is removed as
- There's no comment why it is needed.
- Actually SetupWizard gets stack as that forces users to see
  WirelessSettings in SetupWizard.

The other changes:
- Move back LocalePickerFragment to LocalePicker.
- Make <activity> for LocalePicker in AndroidManifest <activity-alias>
- Add a short comment about how getComponent(), which should be a key
  for understanding how top-level settings work.
- Modify LanguageSettings so that it corectly points LocalePicker as
  a fragment.

Change-Id: I78d356e40af896ba1aab72fba12c90467371c7b0

- Add button bar feature toward SettingsPreferenceFragment,
  which has existed in PreferenceActivity and has been used
  (probably) only by Settings app.
- super.onActivityCreated() is not called at the beggining of
  WifiSettings#onActivityCreated(), the parent method assumes
  the child should have prepared PreferenceScreen, while
  WifiSettings cannot do until the parent Activity is ready.
- Call SetHasOptionMenu() should be called AFTER the parent
  Activity is ready. It is not documented, so it would be better
  to file another bug.
- Add exception to proguard...

Change-Id: Iebd27f0cb0abdbee9b4b1cc9b00f4bf127f7815d

Bug: 2933151

Need to add proguard.flag, as the Activity crashes without it.

Change-Id: Icbc75be4a4183920ed472ac64cc509115260f865