Fix strict mode violation on document mode initialization.

chrome/android/java/src/org/chromium/chrome/browser/init/ChromeBrowserInitializer.java

Index: chrome/android/java/src/org/chromium/chrome/browser/init/ChromeBrowserInitializer.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/init/ChromeBrowserInitializer.java b/chrome/android/java/src/org/chromium/chrome/browser/init/ChromeBrowserInitializer.java
index 1f017c85e28963da9f81400530f170396b250610..a8079d0b26b97511605ed5e45e17859aa506b59e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/init/ChromeBrowserInitializer.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/init/ChromeBrowserInitializer.java
@@ -24,6 +24,7 @@ import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.ChromeVersionInfo;
 import org.chromium.chrome.browser.FileProviderHelper;
 import org.chromium.chrome.browser.device.DeviceClassManager;
+import org.chromium.chrome.browser.tabmodel.document.DocumentTabModelImpl;
 import org.chromium.content.app.ContentApplication;
 import org.chromium.content.browser.BrowserStartupController;
 import org.chromium.content.browser.DeviceUtils;
@@ -104,6 +105,15 @@ public class ChromeBrowserInitializer {
     }
 
 
+    /**
+     * Pre-load shared prefs to avoid being blocked on the
+     * disk access async task in the future.
+     */
+    private void warmUpSharedPrefs() {
+        PreferenceManager.getDefaultSharedPreferences(mApplication);
+        DocumentTabModelImpl.warmUpSharedPrefs(mApplication);
+    }
+
     private void preInflationStartup() {
         ThreadUtils.assertOnUiThread();
         if (mPreInflationStartupComplete) return;
@@ -115,8 +125,7 @@ public class ChromeBrowserInitializer {
         waitForDebuggerIfNeeded();
         configureStrictMode();
 
-        // Warm up the shared prefs stored.
-        PreferenceManager.getDefaultSharedPreferences(mApplication);
+        warmUpSharedPrefs();
 
         DeviceUtils.addDeviceSpecificUserAgentSwitch(mApplication);