Add NoStatePrefetch to field_trial_testing_config.json

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

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
index 2d629d52573097dad3912ba7d53f5d2128e52031..dfb335d1fba03e913b55592dd72ab1ac7c7f0b22 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
@@ -132,6 +132,7 @@ public class CustomTabsConnection {
     private final AtomicBoolean mWarmupHasBeenCalled = new AtomicBoolean();
     private final AtomicBoolean mWarmupHasBeenFinished = new AtomicBoolean();
     private ExternalPrerenderHandler mExternalPrerenderHandler;
+    private boolean mForcePrerenderForTesting;
 
     // Conversion between native TimeTicks and SystemClock.uptimeMillis().
     private long mNativeTickOffsetUs;
@@ -178,6 +179,7 @@ public class CustomTabsConnection {
 
     public boolean newSession(CustomTabsSessionToken session) {
         boolean success = newSessionInternal(session);
+        if (mForcePrerenderForTesting) mClientManager.setPrerenderCellularForSession(session, true);
         logCall("newSession()", success);
         return success;
     }
@@ -975,4 +977,9 @@ public class CustomTabsConnection {
     void ban(Context context, int uid) {
         mClientManager.ban(uid);
     }
+
+    @VisibleForTesting
+    void setForcePrerender(boolean force) {
+        mForcePrerenderForTesting = force;
+    }
 }