Allow posting the CronetEngine UI Thread initialization on a custom Ui executor instead of the defa…

components/cronet/android/java/src/org/chromium/net/impl/CronetEngineBuilderImpl.java

Index: components/cronet/android/java/src/org/chromium/net/impl/CronetEngineBuilderImpl.java
diff --git a/components/cronet/android/java/src/org/chromium/net/impl/CronetEngineBuilderImpl.java b/components/cronet/android/java/src/org/chromium/net/impl/CronetEngineBuilderImpl.java
index c4900ec235eeb2e12b6dac0bb83bf3975e8d5f3b..075b4ca30448db49b18adba5b50efbc09bd437d8 100644
--- a/components/cronet/android/java/src/org/chromium/net/impl/CronetEngineBuilderImpl.java
+++ b/components/cronet/android/java/src/org/chromium/net/impl/CronetEngineBuilderImpl.java
@@ -24,6 +24,7 @@ import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Set;
+import java.util.concurrent.Executor;
 import java.util.regex.Pattern;
 
 /**
@@ -80,6 +81,7 @@ public abstract class CronetEngineBuilderImpl extends ICronetEngineBuilder {
     private String mUserAgent;
     private String mStoragePath;
     private VersionSafeCallbacks.LibraryLoader mLibraryLoader;
+    private Executor mUiExecutor;
     private boolean mQuicEnabled;
     private boolean mHttp2Enabled;
     private boolean mSdchEnabled;
@@ -148,6 +150,16 @@ public abstract class CronetEngineBuilderImpl extends ICronetEngineBuilder {
     }
 
     @Override
+    public CronetEngineBuilderImpl setUiThreadExecutor(Executor uiExecutor) {
+        mUiExecutor = uiExecutor;
+        return this;
+    }
+
+    Executor uiExecutor() {
+        return mUiExecutor;
+    }
+
+    @Override
     public CronetEngineBuilderImpl enableQuic(boolean value) {
         mQuicEnabled = value;
         return this;