[Android]Don't check for child account/EDU device for every activity.

chrome/android/java/src/org/chromium/chrome/browser/firstrun/ForcedSigninProcessor.java

Index: chrome/android/java/src/org/chromium/chrome/browser/firstrun/ForcedSigninProcessor.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/firstrun/ForcedSigninProcessor.java b/chrome/android/java/src/org/chromium/chrome/browser/firstrun/ForcedSigninProcessor.java
new file mode 100644
index 0000000000000000000000000000000000000000..f4b90b4007ac8e6965939118549dd51dfd2227be
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/firstrun/ForcedSigninProcessor.java
@@ -0,0 +1,71 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.firstrun;
+
+import android.accounts.Account;
+import android.content.Context;
+
+import org.chromium.chrome.browser.services.AndroidEduAndChildAccountHelper;
+import org.chromium.chrome.browser.signin.SigninManager;
+import org.chromium.chrome.browser.util.FeatureUtilities;
+import org.chromium.sync.signin.AccountManagerHelper;
+import org.chromium.sync.signin.ChromeSigninController;
+
+/**
+ * A helper to perform all necessary steps for forced sign in.
+ * The helper performs:
+ * - necessary Android EDU and child account checks;
+ * - automatic non-interactive forced sign in for Android EDU and child accounts; and
+ * The helper calls the observer's onSignInComplete() if
+ * - nothing needs to be done, or when
+ * - the sign in is complete.
+ *
+ * Usage:
+ * ForcedSigninProcessor.start(appContext).
+ */
+public final class ForcedSigninProcessor {
+    /*
+     * Only for static usage.
+     */
+    private ForcedSigninProcessor() {}
+
+    /**
+     * Check whether a forced automatic signin is required and process it if it is.
+     * This is triggered once per Chrome Application lifetime and everytime the Account state
+     * changes with early exit if an account has already been signed in.
+     */
+    public static void start(final Context appContext) {
+        if (ChromeSigninController.get(appContext).isSignedIn()) return;
+        new AndroidEduAndChildAccountHelper() {
+            @Override
+            public void onParametersReady() {
+                boolean isAndroidEduDevice = isAndroidEduDevice();
+                boolean hasChildAccount = hasChildAccount();
+                // If neither a child account or and EDU device, we return.
+                if (!isAndroidEduDevice && !hasChildAccount) return;
+                // Child account and EDU device at the same time is not supported.
+                assert !(isAndroidEduDevice && hasChildAccount);
+                int signinType = hasChildAccount ? SigninManager.SIGNIN_TYPE_FORCED_CHILD_ACCOUNT
+                                                 : SigninManager.SIGNIN_TYPE_FORCED_EDU;
+                processAutomaticSignIn(appContext, signinType);
+            }
+        }.start(appContext);
+    }
+
+    /**
+     * Processes the fully automatic non-FRE-related forced sign-in.
+     * This is used to enforce the environment for Android EDU and child accounts.
+     */
+    private static void processAutomaticSignIn(Context appContext, int signinType) {
+        final Account[] googleAccounts = AccountManagerHelper.get(appContext).getGoogleAccounts();
+        SigninManager signinManager = SigninManager.get(appContext);
+        if (!FeatureUtilities.canAllowSync(appContext) || !signinManager.isSignInAllowed()
+                || googleAccounts.length != 1) {
+            return;
+        }
+        signinManager.signInToSelectedAccount(null, googleAccounts[0], signinType,
+                SigninManager.SIGNIN_SYNC_IMMEDIATELY, false, null);
+    }
+}