Disable two plugin power saver tests on macOS.

chrome/browser/plugins/plugin_power_saver_browsertest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/stl_util.h"
@@ skipping 364 matching lines @@
         base::Bind(&CompareSnapshotToReference, reference, &snapshot_matches,
                    base::MessageLoop::QuitWhenIdleClosure()),
         kN32_SkColorType);
 
     content::RunMessageLoop();
 
     return snapshot_matches;
   }
 
   // TODO(tommycli): Remove this once all flakiness resolved.
   bool PixelTestsEnabled() {

[tommycli, 2016/12/15 20:32:36]

Can you disable the test here? (i.e. does disabling the pixel tests portion of
this browser test fix the issue?)

 #if defined(OS_WIN) || defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER)
     // Flaky on Windows, Asan, and Msan bots.
     // See crbug.com/549285 and crbug.com/512140.
     return false;
 #elif defined(OS_CHROMEOS)
     // Because ChromeOS cannot use software rendering and the pixel tests
     // continue to flake with hardware acceleration, disable these on ChromeOS.
     return false;
 #else
     return true;
 #endif
   }
 
  private:
   base::test::ScopedFeatureList feature_list;
 };
 
 IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, EssentialPlugins) {
   LoadHTML("/essential_plugins.html");
 
   VerifyPluginMarkedEssential(GetActiveWebContents(), "small_same_origin");
   VerifyPluginMarkedEssential(GetActiveWebContents(),
                               "small_same_origin_poster");
   VerifyPluginMarkedEssential(GetActiveWebContents(), "large_cross_origin");
   VerifyPluginMarkedEssential(GetActiveWebContents(),
                               "medium_16_9_cross_origin");
 }
 
-IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, SmallCrossOrigin) {
+// This test fail on macOS 10.12. https://crbug.com/599484.
+#if defined(OS_MACOSX)
+#define MAYBE_SmallCrossOrigin DISABLED_SmallCrossOrigin
+#else
+#define MAYBE_SmallCrossOrigin SmallCrossOrigin
+#endif
+IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, MAYBE_SmallCrossOrigin) {
   LoadHTML("/small_cross_origin.html");
 
   VerifyPluginIsThrottled(GetActiveWebContents(), "plugin");
   VerifyPluginIsPlaceholderOnly("plugin_poster");
 
   EXPECT_TRUE(
       VerifySnapshot(FILE_PATH_LITERAL("small_cross_origin_expected.png")));
 
   SimulateClickAndAwaitMarkedEssential("plugin", gfx::Point(50, 50));
   SimulateClickAndAwaitMarkedEssential("plugin_poster", gfx::Point(50, 150));
@@ skipping 21 matching lines @@
 
   VerifyPluginIsThrottled(GetActiveWebContents(), "plugin_16");
   VerifyPluginIsThrottled(GetActiveWebContents(), "plugin_32");
   VerifyPluginIsThrottled(GetActiveWebContents(), "plugin_16_64");
   VerifyPluginIsThrottled(GetActiveWebContents(), "plugin_64_16");
 
   EXPECT_TRUE(
       VerifySnapshot(FILE_PATH_LITERAL("smaller_than_play_icon_expected.png")));
 }
 
-IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, PosterTests) {
+// This test fail on macOS 10.12. https://crbug.com/599484.
+#if defined(OS_MACOSX)
+#define MAYBE_PosterTests DISABLED_PosterTests
+#else
+#define MAYBE_PosterTests PosterTests
+#endif
+IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, MAYBE_PosterTests) {
   // This test simultaneously verifies the varied supported poster syntaxes,
   // as well as verifies that the poster is rendered correctly with various
   // mismatched aspect ratios and sizes, following the same rules as VIDEO.
   LoadHTML("/poster_tests.html");
 
   VerifyPluginIsPlaceholderOnly("plugin_src");
   VerifyPluginIsPlaceholderOnly("plugin_srcset");
 
   VerifyPluginIsPlaceholderOnly("plugin_poster_param");
   VerifyPluginIsPlaceholderOnly("plugin_embed_src");
@@ skipping 132 matching lines @@
 IN_PROC_BROWSER_TEST_F(PluginPowerSaverPreferHtmlBrowserTest,
                        ThrottlePluginsOnAllowContentSetting) {
   HostContentSettingsMap* content_settings_map =
       HostContentSettingsMapFactory::GetForProfile(browser()->profile());
 
   content_settings_map->SetDefaultContentSetting(CONTENT_SETTINGS_TYPE_PLUGINS,
                                                  CONTENT_SETTING_ALLOW);
   LoadPeripheralPlugin();
   VerifyPluginIsThrottled(GetActiveWebContents(), "plugin");
 }