[Android WebView] Implement initial settings and callback support for Service Workers.

net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java

Index: net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java
diff --git a/net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java b/net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java
index 6bb93ca1858bcd9472cd7d64ef2875fe96adbd80..7f161937aa348d6a73e27483180449e5682e1d6a 100644
--- a/net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java
+++ b/net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java
@@ -510,6 +510,11 @@ public class TestWebServer {
         }
         StatusLine sl = httpResponse.getStatusLine();
         Log.i(TAG, sl.getStatusCode() + "(" + sl.getReasonPhrase() + ")");
+
+        if (path.endsWith(".js")) {
+            httpResponse.addHeader("Content-Type", "application/javascript");
+        }
+
         setDateHeaders(httpResponse);
         return httpResponse;
     }