webapk: Avoid overwriting default CreationParams

chrome/android/java/src/org/chromium/chrome/browser/prerender/ExternalPrerenderHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/prerender/ExternalPrerenderHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/prerender/ExternalPrerenderHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/prerender/ExternalPrerenderHandler.java
index bdbec527b24b2f30f3950532037716a1059dc248..c330fc49b50823d326aa0e4b1631362e93f73e57 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/prerender/ExternalPrerenderHandler.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/prerender/ExternalPrerenderHandler.java
@@ -14,6 +14,7 @@ import android.view.WindowManager;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.JNINamespace;
+import org.chromium.base.process_launcher.ChildProcessCreationParams;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.WebContentsFactory;
 import org.chromium.chrome.browser.profiles.Profile;
@@ -49,10 +50,11 @@ public class ExternalPrerenderHandler {
      *         {@code null} if unsuccessful.
      */
     public Pair<WebContents, WebContents> addPrerender(Profile profile, String url, String referrer,
-            Rect bounds, boolean prerenderOnCellular) {
-        WebContents dummyWebContents = WebContentsFactory.createWebContents(false, false);
-        WebContents prerenderingWebContents =
-                addPrerender(profile, dummyWebContents, url, referrer, bounds, prerenderOnCellular);
+            Rect bounds, boolean prerenderOnCellular, int childProcessParamId) {
+        WebContents dummyWebContents =
+                WebContentsFactory.createWebContents(childProcessParamId, false, false);
+        WebContents prerenderingWebContents = addPrerender(profile, dummyWebContents, url, referrer,
+                bounds, prerenderOnCellular, childProcessParamId);
         if (dummyWebContents == null) return null;
         if (prerenderingWebContents != null) {
             return Pair.create(dummyWebContents, prerenderingWebContents);
@@ -75,7 +77,8 @@ public class ExternalPrerenderHandler {
      * @return The prerendering {@link WebContents} owned by PrerenderManager.
      */
     public WebContents addPrerender(Profile profile, WebContents webContents, String url,
-            String referrer, Rect bounds, boolean prerenderOnCellular) {
+            String referrer, Rect bounds, boolean prerenderOnCellular, int childProcessParamId) {
+        if (childProcessParamId != ChildProcessCreationParams.DEFAULT_ID) return null;
         return nativeAddPrerender(mNativeExternalPrerenderHandler, profile, webContents, url,
                 referrer, bounds.top, bounds.left, bounds.bottom, bounds.right,
                 prerenderOnCellular);