Flush SequenceWorkerPool tasks after each unit test.

content/public/test/content_test_suite_base.cc

Index: content/public/test/content_test_suite_base.cc
===================================================================
--- content/public/test/content_test_suite_base.cc	(revision 186525)
+++ content/public/test/content_test_suite_base.cc	(working copy)
@@ -8,10 +8,13 @@
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/test/test_suite.h"
+#include "base/threading/sequenced_worker_pool.h"
+#include "content/browser/browser_thread_impl.h"
 #include "content/common/url_schemes.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_paths.h"
 #include "media/base/media.h"
+#include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/compositor/compositor_setup.h"
 
@@ -26,6 +29,17 @@
 
 namespace content {
 
+class ContentTestSuiteBaseListener : public testing::EmptyTestEventListener {
+ public:
+  ContentTestSuiteBaseListener() {
+  }
+  virtual void OnTestEnd(const testing::TestInfo& test_info) OVERRIDE {
+    BrowserThreadImpl::FlushThreadPoolHelper();
+  }
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ContentTestSuiteBaseListener);
+};
+
 ContentTestSuiteBase::ContentTestSuiteBase(int argc, char** argv)
     : base::TestSuite(argc, argv),
       external_libraries_enabled_(true) {
@@ -57,6 +71,9 @@
 
   // Mock out the compositor on platforms that use it.
   ui::SetupTestCompositor();
+
+  testing::UnitTest::GetInstance()->listeners().Append(
+      new ContentTestSuiteBaseListener);
 }
 
 }  // namespace content