Enabling sampling of UMA and crash reports on Android.

chrome/android/java/src/org/chromium/chrome/browser/metrics/UmaSessionStats.java

Index: chrome/android/java/src/org/chromium/chrome/browser/metrics/UmaSessionStats.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/metrics/UmaSessionStats.java b/chrome/android/java/src/org/chromium/chrome/browser/metrics/UmaSessionStats.java
index 2ebed96d34158787b336c2510d21812985576498..c1bf81c3554e4e963c59025ba5269ca8937d5b37 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/metrics/UmaSessionStats.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/metrics/UmaSessionStats.java
@@ -153,12 +153,33 @@ public class UmaSessionStats implements NetworkChangeNotifier.ConnectionTypeObse
     }
 
     /**
-     * Updates the state of the MetricsService to account for the user's preferences.
+     * Updates the metrics services based on a change of consent. This can happen during first-run
+     * flow, and when the user changes their preferences.
      */
-    public void updateMetricsServiceState() {
-        boolean mayRecordStats = !PrivacyPreferencesManager.getInstance()
-                .isNeverUploadCrashDump();
-        boolean mayUploadStats = mReportingPermissionManager.isUmaUploadPermitted();
+    public static void changeMetricsReportingConsent(boolean consent) {
+        PrivacyPreferencesManager privacyManager = PrivacyPreferencesManager.getInstance();
+        // Update the new two-choice Android preference.
+        privacyManager.setUsageAndCrashReporting(consent);
+        // Update the old three-choice Android preference, and synchronize with Chrome local state
+        // preferences. Note, this forces the three-choice preferences to be either never upload,
+        // or only upload on WiFi.
+        privacyManager.initCrashUploadPreference(consent);
+
+        // Perform native changes needed to reflect the new consent value.
+        nativeChangeMetricsReportingConsent(consent);
+
+        updateMetricsServiceState();
+    }
+
+    /**
+     * Updates the state of MetricsService to account for the user's preferences. Android prefs and
+     * Chrome Local State prefs for metrics reporting should be in sync before calling this
+     * function.
+     */
+    public static void updateMetricsServiceState() {
+        PrivacyPreferencesManager privacyManager = PrivacyPreferencesManager.getInstance();
+        boolean mayRecordStats = !privacyManager.isNeverUploadCrashDump();
+        boolean mayUploadStats = privacyManager.isUmaUploadPermitted();
 
         // Re-start the MetricsService with the given parameters.
         nativeUpdateMetricsServiceState(mayRecordStats, mayUploadStats);
@@ -192,6 +213,10 @@ public class UmaSessionStats implements NetworkChangeNotifier.ConnectionTypeObse
             prefManager.setUsageAndCrashReporting(prefBridge.isMetricsReportingEnabled());
         }
 
+        // Update the metrics sampling state so it's available before the native feature list is
+        // available.
+        prefManager.setClientInMetricsSample(UmaUtils.isClientInMetricsReportingSample());
+
         // Make sure preferences are in sync.
         prefManager.syncUsageAndCrashReportingPrefs();
     }
@@ -208,9 +233,10 @@ public class UmaSessionStats implements NetworkChangeNotifier.ConnectionTypeObse
     public static void registerSyntheticFieldTrial(String trialName, String groupName) {
         nativeRegisterSyntheticFieldTrial(trialName, groupName);
     }
-
     private static native long nativeInit();
-    private native void nativeUpdateMetricsServiceState(boolean mayRecord, boolean mayUpload);
+    private static native void nativeChangeMetricsReportingConsent(boolean consent);
+    private static native void nativeUpdateMetricsServiceState(
+            boolean mayRecord, boolean mayUpload);
     private native void nativeUmaResumeSession(long nativeUmaSessionStats);
     private native void nativeUmaEndSession(long nativeUmaSessionStats);
     private static native void nativeLogRendererCrash();