customtabs: Intialize renderer at WebContents creation time.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
index cdbb845f42b526104106f6f94cabb6e772ebb199..a662d005c8553b8b3afb87cf7967e258ad40e63d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
@@ -529,7 +529,9 @@ public class CustomTabActivity extends ChromeActivity {
         }
         RecordHistogram.recordEnumeratedHistogram("CustomTabs.WebContentsStateOnLaunch",
                 webContentsStateOnLaunch, WEBCONTENTS_STATE_MAX);
-        if (webContents == null) webContents = WebContentsFactory.createWebContents(false, false);
+        if (webContents == null) {
+            webContents = WebContentsFactory.createWebContentsWithWarmRenderer(false, false);
+        }
         if (!mHasPrerendered) {
             customTabsConnection.resetPostMessageHandlerForSession(mSession, webContents);
         }