Android: Make the spare renderer accessible to all Chrome tabs.

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 71313304b525e0377897de69f8c8604e1775f89e..e1969e7eeac8dfe7ea7ee1bb21e96c4d6fca2dc5 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -52,6 +52,7 @@ import org.chromium.chrome.browser.SwipeRefreshHandler;
 import org.chromium.chrome.browser.TabState;
 import org.chromium.chrome.browser.TabState.WebContentsState;
 import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.WarmupManager;
 import org.chromium.chrome.browser.WebContentsFactory;
 import org.chromium.chrome.browser.banners.AppBannerManager;
 import org.chromium.chrome.browser.bookmarks.BookmarkUtils;
@@ -1461,7 +1462,12 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
 
             boolean creatingWebContents = webContents == null;
             if (creatingWebContents) {
-                webContents = WebContentsFactory.createWebContents(isIncognito(), initiallyHidden);
+                webContents = WarmupManager.getInstance().takeSpareWebContents(
+                        isIncognito(), initiallyHidden);
+                if (webContents == null) {
+                    webContents =
+                            WebContentsFactory.createWebContents(isIncognito(), initiallyHidden);
+                }
             }
 
             ContentViewCore contentViewCore = ContentViewCore.fromWebContents(webContents);