Mark ExtensionApiTest.CaptureVisibleTabPng as flaky

BUG=83876
TEST=no
TBR=skerner@chromium.org

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86603 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/extension_tabs_apitest.cc

@@ -105,7 +105,8 @@ IN_PROC_BROWSER_TEST_F(ExtensionApiTest, CaptureVisibleTabJpeg) {
                                   "test_jpeg.html")) << message_;
 }
 
-IN_PROC_BROWSER_TEST_F(ExtensionApiTest, CaptureVisibleTabPng) {
+// Test is flaky. See http://crbug.com/83876
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, FLAKY_CaptureVisibleTabPng) {
   host_resolver()->AddRule("a.com", "127.0.0.1");
   host_resolver()->AddRule("b.com", "127.0.0.1");
   ASSERT_TRUE(StartTestServer());