Support ChildProcessAllocatorSettings in JUnit4 tests

base/test/android/javatests/src/org/chromium/base/test/BaseJUnit4ClassRunner.java

Index: base/test/android/javatests/src/org/chromium/base/test/BaseJUnit4ClassRunner.java
diff --git a/base/test/android/javatests/src/org/chromium/base/test/BaseJUnit4ClassRunner.java b/base/test/android/javatests/src/org/chromium/base/test/BaseJUnit4ClassRunner.java
index 922536b89b881a08d6603ddf38ac4b47fb3c4b0d..57bed8fa558757677c595eb2a62585a78828f6ec 100644
--- a/base/test/android/javatests/src/org/chromium/base/test/BaseJUnit4ClassRunner.java
+++ b/base/test/android/javatests/src/org/chromium/base/test/BaseJUnit4ClassRunner.java
@@ -84,7 +84,7 @@ public class BaseJUnit4ClassRunner extends AndroidJUnit4ClassRunner {
                 new AndroidRunnerParams(InstrumentationRegistry.getInstrumentation(),
                         InstrumentationRegistry.getArguments(), false, 0L, false));
         mSkipChecks = mergeList(checks, defaultSkipChecks());
-        mPreTestHooks = defaultPreTestHooks();
+        mPreTestHooks = mergeList(hooks, defaultPreTestHooks());
     }
 
     /**