[Chrome Home Survey] Prevent any action for tablets

Bug: 783991
Change-Id: I3ba066c89f8733e2b20acc71e2103f467749cae4
Reviewed-on: https://chromium-review.googlesource.com/772800Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Daniel Park <danielpark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517186}

chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/PrivacyPreferencesManager.java

@@ -20,6 +20,7 @@ import org.chromium.chrome.browser.preferences.PrefServiceBridge;
 import org.chromium.chrome.browser.survey.SurveyController;
 import org.chromium.components.minidump_uploader.util.CrashReportingPermissionManager;
 import org.chromium.components.minidump_uploader.util.NetworkPermissionUtil;
+import org.chromium.ui.base.DeviceFormFactor;
 
 /**
  * Reads, writes, and migrates preferences related to network usage and privacy.
@@ -225,7 +226,7 @@ public class PrivacyPreferencesManager implements CrashReportingPermissionManage
     public void setUsageAndCrashReporting(boolean enabled) {
         mSharedPreferences.edit().putBoolean(PREF_METRICS_REPORTING, enabled).apply();
         syncUsageAndCrashReportingPrefs();
-        if (!enabled) {
+        if (!enabled && !DeviceFormFactor.isTablet()) {
             SurveyController.getInstance().clearCache(ContextUtils.getApplicationContext());
         }
     }

chrome/android/java/src/org/chromium/chrome/browser/survey/ChromeHomeSurveyController.java

@@ -29,6 +29,7 @@ import org.chromium.chrome.browser.util.FeatureUtilities;
 import org.chromium.components.variations.VariationsAssociatedData;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_public.browser.WebContentsObserver;
+import org.chromium.ui.base.DeviceFormFactor;
 
 /**
  * Class that controls if and when to show surveys related to the Chrome Home experiment.
@@ -88,6 +89,7 @@ public class ChromeHomeSurveyController {
         if (CommandLine.getInstance().hasSwitch(ChromeSwitches.CHROME_HOME_FORCE_ENABLE_SURVEY)) {
             return true;
         }
+        if (DeviceFormFactor.isTablet()) return false;
         if (!isUMAEnabled()) return false;
         if (AccessibilityUtil.isAccessibilityEnabled()) return false;
         if (hasInfoBarBeenDisplayed()) return false;