Add javatests for the WebView SafeBrowsing feature

android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java

Index: android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java
diff --git a/android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java b/android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java
index dd079f1baaf1f5969852bd23d70cc5c821062187..5546c5cb4adc13a9399fc0c4263a00e74c714f76 100644
--- a/android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java
+++ b/android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java
@@ -104,11 +104,16 @@ public class AwTestBase
         getInstrumentation().runOnMainSync(new Runnable() {
             @Override
             public void run() {
-                mBrowserContext = new AwBrowserContext(prefs, appContext);
+                mBrowserContext = createAwBrowserContextOnUiThread(prefs, appContext);
             }
         });
     }
 
+    protected AwBrowserContext createAwBrowserContextOnUiThread(
+            InMemorySharedPreferences prefs, Context appContext) {
+        return new AwBrowserContext(prefs, appContext);
+    }
+
     protected void startBrowserProcess() throws Exception {
         // The Activity must be launched in order for proper webview statics to be setup.
         getActivity();