Restrict number of BlimpContents to [0, 1]

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 e914ba5da5ff5d7812c01579ecc70b25ee13ad2b..6ae4ba3efe7603b59a09ba9506a3edcd8d77d2b9 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
@@ -1503,7 +1503,11 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
                 Profile profile = Profile.getLastUsedProfile();
                 if (mIncognito) profile = profile.getOffTheRecordProfile();
                 mBlimpContents = nativeInitBlimpContents(mNativeTabAndroid, profile);
-                getBlimpContents().addObserver(new TabBlimpContentsObserver(this));
+                if (mBlimpContents != null) {
+                    getBlimpContents().addObserver(new TabBlimpContentsObserver(this));
+                } else {
+                    mBlimp = false;
+                }
             }
 
             boolean creatingWebContents = webContents == null;