customtabs: Access the throttling shared preferences from warmup().

chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
index 99fb999e82a531c22642077622bc607d40ad8bb4..f2694e7627cb265a30ad6f42815e97692579968c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
@@ -233,6 +233,7 @@ public class CustomTabsConnection {
         if (!isCallerForegroundOrSelf()) return false;
         mClientManager.recordUidHasCalledWarmup(Binder.getCallingUid());
         final boolean initialized = !mWarmupHasBeenCalled.compareAndSet(false, true);
+        final int uid = Binder.getCallingUid();
         // The call is non-blocking and this must execute on the UI thread, post a task.
         ThreadUtils.postOnUiThread(new Runnable() {
             @Override
@@ -241,6 +242,10 @@ public class CustomTabsConnection {
                 if (mayCreateSpareWebContents && mSpeculation == null
                         && !SysUtils.isLowEndDevice()) {
                     WarmupManager.getInstance().createSpareWebContents();
+                    // The throttling database uses shared preferences, that can cause a StrictMode
+                    // violation on the first access. Make sure that this access is not in
+                    // mayLauchUrl.
+                    RequestThrottler.getForUid(mApplication, uid);
                 }
                 mWarmupHasBeenFinished.set(true);
             }