Implements layoutTestController.overridePreference()

This change provides the infrastructure for
layoutTestController.overridePreference(). Currently, we only provide an
implementation for the preference 'WebKitOfflineWebApplicationCacheEnabled',
which is required by the layout test http/tests/appcache/disabled.html.

Change-Id: I8552f2f4e23b982db2d067ffa20c052e56d8fb7f

tests/DumpRenderTree/src/com/android/dumprendertree/CallbackProxy.java

@@ -73,6 +73,7 @@ public class CallbackProxy extends Handler implements EventSender, LayoutTestCon
     private static final int LAYOUT_DUMP_DATABASE_CALLBACKS = 41;
     private static final int LAYOUT_SET_CAN_OPEN_WINDOWS = 42;
     private static final int SET_GEOLOCATION_PERMISSION = 43;
+    private static final int OVERRIDE_PREFERENCE = 44;
     
     CallbackProxy(EventSender eventSender, 
             LayoutTestController layoutTestController) {
@@ -266,6 +267,12 @@ public class CallbackProxy extends Handler implements EventSender, LayoutTestCon
             mLayoutTestController.setGeolocationPermission(
                     msg.arg1 == 1 ? true : false);
             break;
+
+        case OVERRIDE_PREFERENCE:
+            String key = msg.getData().getString("key");
+            boolean value = msg.getData().getBoolean("value");
+            mLayoutTestController.overridePreference(key, value);
+            break;
         }
     }
 
@@ -484,4 +491,11 @@ public class CallbackProxy extends Handler implements EventSender, LayoutTestCon
     public void setGeolocationPermission(boolean allow) {
         obtainMessage(SET_GEOLOCATION_PERMISSION, allow ? 1 : 0, 0).sendToTarget();
     }
+
+    public void overridePreference(String key, boolean value) {
+        Message message = obtainMessage(OVERRIDE_PREFERENCE);
+        message.getData().putString("key", key);
+        message.getData().putBoolean("value", value);
+        message.sendToTarget();
+    }
 }

tests/DumpRenderTree/src/com/android/dumprendertree/FileFilter.java

@@ -83,7 +83,6 @@ public class FileFilter {
         // should pass all tests. They are skipped only temporarily.
         // TODO: Fix these failing tests and remove them from this list.
         ignoreResultList.add("http/tests/appcache/auth.html"); // DumpRenderTree throws exception when authentication fails
-        ignoreResultList.add("http/tests/appcache/disabled.html"); // Missing layoutTestController.overridePreference
         ignoreResultList.add("http/tests/appcache/empty-manifest.html"); // flaky
         ignoreResultList.add("http/tests/appcache/foreign-iframe-main.html"); // flaky - skips states
         ignoreResultList.add("http/tests/appcache/manifest-with-empty-file.html"); // flaky

tests/DumpRenderTree/src/com/android/dumprendertree/LayoutTestController.java

@@ -65,4 +65,6 @@ public interface LayoutTestController {
 
     // For Geolocation tests
     public void setGeolocationPermission(boolean allow);
+
+    public void overridePreference(String key, boolean value);
 }

tests/DumpRenderTree/src/com/android/dumprendertree/TestShellActivity.java

@@ -61,6 +61,9 @@ public class TestShellActivity extends Activity implements LayoutTestController
 
     static enum DumpDataType {DUMP_AS_TEXT, EXT_REPR, NO_OP}
 
+    // String constants for use with layoutTestController.overridePreferences
+    private final String WEBKIT_OFFLINE_WEB_APPLICATION_CACHE_ENABLED = "WebKitOfflineWebApplicationCacheEnabled";
+
     public class AsyncHandler extends Handler {
         @Override
         public void handleMessage(Message msg) {
@@ -459,6 +462,16 @@ public class TestShellActivity extends Activity implements LayoutTestController
         mGeolocationPermission = allow;
     }
 
+    public void overridePreference(String key, boolean value) {
+        // TODO: We should look up the correct WebView for the frame which
+        // called the layoutTestController method. Currently, we just use the
+        // WebView for the main frame. EventSender suffers from the same
+        // problem.
+        if (key.equals(WEBKIT_OFFLINE_WEB_APPLICATION_CACHE_ENABLED)) {
+            mWebView.getSettings().setAppCacheEnabled(value);
+        }
+    }
+
     private final WebViewClient mViewClient = new WebViewClient(){
         @Override
         public void onPageFinished(WebView view, String url) {