Improvements to unit test behavior.

- Standardize the test timeout implementation using a new TestHandler::SetTestTimeout method and enable timeouts for almost all tests. The test timeout can be disabled globally using a new `--disable-test-timeout` command-line flag.
- Wait for TestHandler object destruction at the end of each test using a new ReleaseAndWaitForDestructor function. This avoids test state leakage and verifies that no object references are leaked.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1964 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

tests/unittests/download_unittest.cc

@@ -133,6 +133,9 @@ class DownloadTestHandler : public TestHandler {
 
     // Create the browser
     CreateBrowser(kTestEntryUrl);
+
+    // Time out the test after a reasonable period of time.
+    SetTestTimeout();
   }
 
   void OnLoadEnd(CefRefPtr<CefBrowser> browser,
@@ -261,4 +264,5 @@ class DownloadTestHandler : public TestHandler {
 TEST(DownloadTest, Download) {
   CefRefPtr<DownloadTestHandler> handler = new DownloadTestHandler();
   handler->ExecuteTest();
+  ReleaseAndWaitForDestructor(handler);
 }