[ChromeSigninIntercept] React to Chrome Signin bubble buttons

On accept: Signin in to chrome with the account and close the bubble.
On decline: Close the bubble.

Metrics to be recorded in a followup CL.

Bug: b:301431278
Low-Coverage-Reason: OTHER One file affected indirectly that is not part of the main changes.
Change-Id: I0afb6f9de3dcc855caf486b56f1c559e4b090777
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4965921
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Ryan Sultanem <rsult@google.com>
Cr-Commit-Position: refs/heads/main@{#1215447}

chrome/browser/resources/signin/dice_web_signin_intercept/chrome_signin/chrome_signin_app.ts

@@ -62,8 +62,7 @@ export class ChromeSigninAppElement extends ChromeSigninAppElementBase {
   }
 
   private onAccept_() {
-    // TODO(b/301431278): change to accept when the reaction is implemented.
-    this.diceWebSigninInterceptBrowserProxy_.cancel();
+    this.diceWebSigninInterceptBrowserProxy_.accept();
   }
 }
 

chrome/browser/signin/dice_web_signin_interceptor.cc

@@ -13,6 +13,7 @@
 #include "base/i18n/case_conversion.h"
 #include "base/metrics/field_trial_params.h"
 #include "base/metrics/histogram_functions.h"
+#include "base/notreached.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task/single_thread_task_runner.h"
@@ -717,7 +718,7 @@ void DiceWebSigninInterceptor::OnInterceptionReadyToBeProcessed(
       break;
     case WebSigninInterceptor::SigninInterceptionType::kChromeSignin:
       callback = base::BindOnce(&DiceWebSigninInterceptor::OnChromeSigninChoice,
-                                base::Unretained(this));
+                                base::Unretained(this), info);
       break;
   }
   ShowSigninInterceptionBubble(bubble_parameters, std::move(callback));
@@ -771,13 +772,30 @@ void DiceWebSigninInterceptor::OnProfileCreationChoice(
 }
 
 void DiceWebSigninInterceptor::OnChromeSigninChoice(
+    const AccountInfo& account_info,
     SigninInterceptionResult result) {
-  if (result == SigninInterceptionResult::kDeclined) {
-    Reset();
-    return;
-  }
+  // In all cases we want to close the bubble after the choice is taken.
+  Reset();
 
-  // TODO(b/301431278): Implement the rest of the cases.
+  switch (result) {
+    case SigninInterceptionResult::kIgnored:
+      // Can happen if the browser isclosed while the bubble is still opened.
+    case SigninInterceptionResult::kNotDisplayed:
+      // Can happen if the web contents is destroyed between the time the bubble
+      // was requested to be displayed and actually being displayed.
+    case SigninInterceptionResult::kDeclined:
+      // The user declined the bubble.
+      break;
+    case SigninInterceptionResult::kAcceptedWithGuest:
+    case SigninInterceptionResult::kAcceptedWithExistingProfile:
+      NOTREACHED_NORETURN()
+          << "Those results are not expected within the Chrome Signin Bubble.";
+    case SigninInterceptionResult::kAccepted:
+      identity_manager_->GetPrimaryAccountMutator()->SetPrimaryAccount(
+          account_info.account_id, signin::ConsentLevel::kSignin,
+          signin_metrics::AccessPoint::
+              ACCESS_POINT_CHROME_SIGNIN_INTERCEPT_BUBBLE);
+  }
 }
 
 void DiceWebSigninInterceptor::OnProfileSwitchChoice(

chrome/browser/signin/dice_web_signin_interceptor.h

@@ -207,7 +207,8 @@ class DiceWebSigninInterceptor : public KeyedService,
                              SigninInterceptionResult switch_profile);
   // Called after the user chose whether they want to sign in to chrome or not
   // via the Chrome Signin Bubble.
-  void OnChromeSigninChoice(SigninInterceptionResult result);
+  void OnChromeSigninChoice(const AccountInfo& account_info,
+                            SigninInterceptionResult result);
 
   // Called when the new profile is created or loaded from disk.
   // `profile_color` is set as theme color for the profile ; it should be