customtabs: Pre-create a renderer in mayLaunchUrl().

content/public/android/java/src/org/chromium/content_public/browser/LoadUrlParams.java

Index: content/public/android/java/src/org/chromium/content_public/browser/LoadUrlParams.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/LoadUrlParams.java b/content/public/android/java/src/org/chromium/content_public/browser/LoadUrlParams.java
index 0f2cd2d53690c9f4d907ad1993884144e3b0448b..f3c099248f6c60bd7ad52245e1cc01e2488645fe 100644
--- a/content/public/android/java/src/org/chromium/content_public/browser/LoadUrlParams.java
+++ b/content/public/android/java/src/org/chromium/content_public/browser/LoadUrlParams.java
@@ -38,6 +38,7 @@ public class LoadUrlParams {
     String mVirtualUrlForDataUrl;
     boolean mCanLoadLocalResources;
     boolean mIsRendererInitiated;
+    boolean mShouldReplaceCurrentEntry;
     long mIntentReceivedTimestamp;
     boolean mHasUserGesture;
 
@@ -394,6 +395,26 @@ public class LoadUrlParams {
     }
 
     /**
+     * @param shouldReplaceCurrentEntry Whether this navigation should replace
+     * the current navigation entry.
+     *
+     * Don't use this. This is a temporary hack that will be removed.
+     * TODO(lizeb): Remove this and {@link getShouldReplaceCurrentEntry} once
+     * crbug.com/521729 is fixed.
+     */
+    public void setShouldReplaceCurrentEntry(boolean shouldReplaceCurrentEntry) {
+        mShouldReplaceCurrentEntry = shouldReplaceCurrentEntry;
+    }
+
+    /**
+     * @return Whether this navigation should replace the current navigation
+     * entry.
+     */
+    public boolean getShouldReplaceCurrentEntry() {
+        return mShouldReplaceCurrentEntry;
+    }
+
+    /**
      * @param intentReceivedTimestamp the timestamp at which Chrome received the intent that
      *                                triggered this URL load, as returned by System.currentMillis.
      */