Make it possible to include another file and port print_preview unit test to unit_tests.

chrome/test/data/webui/test_api.js

Index: chrome/test/data/webui/test_api.js
diff --git a/chrome/test/data/webui/test_api.js b/chrome/test/data/webui/test_api.js
index 140efe7d4b5d9c1743d9ac1f96e095b6b39ba325..9d7c4052c30f601a5e7f88f4fceaece73fb4393c 100644
--- a/chrome/test/data/webui/test_api.js
+++ b/chrome/test/data/webui/test_api.js
@@ -110,6 +110,12 @@ var testing = {};
     testShouldFail: false,
 
     /**
+     * Add libraries before loading this test file.

[dpapad, 2011/11/03 16:14:34]

Would this be a bit more clear as "Libraries to add before loading this test
file."?

[Sheridan Rawlins, 2011/11/05 16:51:25]

Done.

+     * @type {Array.<string>}
+     */
+    addLibraries: [],

[arv (Not doing code reviews), 2011/11/03 19:04:12]

This should just be called libraries or something like that.

[Sheridan Rawlins, 2011/11/05 16:51:25]

Changed to extraLibraries - does that work for you?

Done.

On 2011/11/03 19:04:12, arv wrote:

+
+    /**
      * Override this method to perform initialization during preload (such as
      * creating mocks and registering handlers).
      * @type {Function}
@@ -852,6 +858,11 @@ var testing = {};
   function GEN() {}
 
   /**
+   * During generation phase, this outputs; do nothing at runtime.
+   */
+  function GEN_INCLUDE() {}
+
+  /**
    * At runtime, register the testName with a test fixture. Since this method
    * doesn't have a test fixture, create a dummy fixture to hold its |name|
    * and |testCaseBodies|.
@@ -1304,6 +1315,7 @@ var testing = {};
   window.TEST = TEST;
   window.TEST_F = TEST_F;
   window.GEN = GEN;
+  window.GEN_INCLUDE = GEN_INCLUDE;
   window.WhenTestDone = WhenTestDone;
 
   // Import the Mock4JS helpers.