Update from https://crrev.com/303153

base/android/java/src/org/chromium/base/FieldTrialList.java

Index: base/android/java/src/org/chromium/base/FieldTrialList.java
diff --git a/base/android/java/src/org/chromium/base/FieldTrialList.java b/base/android/java/src/org/chromium/base/FieldTrialList.java
index 6c1f31cea460d834f47014cbf214b6235239c6b4..5fc9a1ff73f789709365a335a61742434dd87e46 100644
--- a/base/android/java/src/org/chromium/base/FieldTrialList.java
+++ b/base/android/java/src/org/chromium/base/FieldTrialList.java
@@ -20,5 +20,14 @@ public class FieldTrialList {
         return nativeFindFullName(trialName);
     }
 
+    /**
+     * @param trialName The name of the trial to get the group for.
+     * @return Whether the trial exists or not.
+     */
+    public static boolean trialExists(String trialName) {
+        return nativeTrialExists(trialName);
+    }
+
     private static native String nativeFindFullName(String trialName);
+    private static native boolean nativeTrialExists(String trialName);
 }