Add ExecuteJavaScriptForTest and make all tests use it

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 3b7a1654a3c6bef5b674c891f1e32949adcafc86..8874bd7375ea74006664616fe1e7e41e5c7d1327 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -2069,6 +2069,22 @@ public class AwContents implements SmartClipProvider,
         mWebContents.evaluateJavaScript(script, jsCallback);
     }
 
+    public void evaluateJavaScriptForTests(String script, final ValueCallback<String> callback) {
+        if (TRACE) Log.d(TAG, "evaluateJavascriptForTests=" + script);
+        if (isDestroyed()) return;
+        JavaScriptCallback jsCallback = null;
+        if (callback != null) {
+            jsCallback = new JavaScriptCallback() {
+                @Override
+                public void handleJavaScriptResult(String jsonResult) {
+                    callback.onReceiveValue(jsonResult);
+                }
+            };
+        }
+
+        mWebContents.evaluateJavaScriptForTests(script, jsCallback);
+    }
+
     /**
      * Post a message to a frame.
      *