Enable p3a by default android (Uplift to 1.19.x)

[deeppandya]

Uplift of #7565
Resolves brave/brave-browser#13486

Approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[deeppandya]

Added commit here : c261046 so closing this PR

[GeetaSarvadnya]

Verification passed on Samsung Galaxy J3 version 5.1.1 running Bravearm 1.20.74.apk

• Verified Implement onboarding for P3A on Android brave-browser#12723 (comment)
• Verified Implement onboarding for P3A on Android brave-browser#12723 (comment)

Logged :
brave/brave-browser#13537
brave/brave-browser#13539
brave/brave-browser#13540
brave/brave-browser#13541

New user

• Verified the initial welcome screen display with P3A checkbox after app launch
  

• Verified that for new users who viewed and clicked on the Continue button in the onboarding screen, the stats p3a.enabled and notice_acknowledged are returng true value in local-state file
  

• Verified that, click on the Private product analytics link redirects to https://brave.com/p3a

• In a clean profile 1.20.74 after app launch, uncheck the P3A checkbox and open brave://local-state file and ensured that p3a.enabled is returning false and p3a.notice_acknowledged is equal to true
  

Existing user

• Verified that the P3A checkbox modal is shown for the existing users on the next app launch
  
• Verified the Graphics displayed on the P3A screen with Figma doc

[GeetaSarvadnya]

@AlexeyBarabash @deeppandya I have set Brave Nightly 1.20.74 as the default browser in Android, the chrome://local-state file is returning the value as 0 for the default browser stats Brave.Core.IsDefault. Looks like P3A stats are not returning correct values in Android. The same thing works fine in Desktop

[AlexeyBarabash]

@GeetaSarvadnya
you are right, for now not all the metrics are supported in Android, #7016 (comment)

[GeetaSarvadnya]

@AlexeyBarabash Can you please specify which metrics are supported in Android right now? So that we can test in this milestone.

[AlexeyBarabash]

@GeetaSarvadnya the metrics table is in message #7016 (comment) .

The supported are:

Brave.Core.BookmarksCountOnProfileLoad.2
Brave.Core.TabCount
Brave.P3A.SentAnswersCount
Brave.Rewards.AdsState.2
Brave.Rewards.AutoContributionsState.2
Brave.Rewards.TipsState.2
Brave.Rewards.WalletBalance.2
Brave.Savings.BandwidthSavingsMB
Brave.Search.DefaultEngine.2
Brave.P2A.TotalAdOpportunities
Brave.P2A.AdOpportunitiesPerSegment.*
Brave.P2A.TotalAdImpressions
Brave.P2A.AdImpressionsPerSegment.*

[GeetaSarvadnya]

Verified the metrics mentioned in the #7566 (comment)

Brave.Core.BookmarksCountOnProfileLoad

• Ensured that the response value for BookmarksCountOnProfileLoad=0 when there is no bookmarks in on profile load.
  
• Ensured that the response value for BookmarksCountOnProfileLoad=1 when the bookmarks count is in the range 0-5
  
• Ensured that the response value for BookmarksCountOnProfileLoad=2 when the bookmarks count is in the range 21-100
  

Brave.Core.TabCount

• Ensured that the response value for Brave.Core.TabCount=0 when tab count is in the range 0-1
  
• Ensured that the response value for Brave.Core.TabCount=1 when tab count is in the range 2-5
  

Brave.P3A.SentAnswersCount

• Ensured that the response value for Brave.P3A.SentAnswersCount=2 when SentAnswersCount is in the range 5-9
  

Brave.Search.DefaultEngine.2

• Ensured that the response value for Brave.Search.DefaultEngine=1 when Search.DefaultEngine is set to google
  
• Ensured that the response value for Brave.Search.DefaultEngine=2 when Search.DefaultEngine is set to duckduckgo
  
• Ensured that the response value for Brave.Search.DefaultEngine=4 when Search.DefaultEngine is set to bing
  
• Ensured that the response value for Brave.Search.DefaultEngine=7 when Search.DefaultEngine is set to Ecosia
  

Brave.Rewards.AdsState

• Encountered and logged Brave.Rewards.AdsState is returning an invalid response value in the initial profile load brave-browser#13546
• Ensured that the response value for Brave.Rewards.AdsState=3 when the wallet is created and ads is enabled
  
• Ensured that the response value for Brave.Rewards.AdsState=4 when the wallet is created and ads is enabled and then disabled ads
  

Brave.Rewards.AutoContributionsState

• Encountered P3A - Incorrect response values for Auto-contribute brave-browser#10088
• Verified that Brave.Rewards.AutoContributionsState stats is shown in a local-state file only when rewards is enabled
• Ensured that the response value for Brave.Rewards.AutoContributionsState=3 when Auto-contribute enabled, no contribution so far
  

Brave.Rewards.TipsState

• Encountered and logged Brave.Rewards.TipsState.2 is returning an invalid value when a one-time tip is sent brave-browser#13549
• Verified that Brave.Rewards.TipsState stats is shown in a local-state file only when rewards is enabled
• Ensured that the response value for Brave.Rewards.TipsState=2 when the Wallet created, no tips sent