media::SilentSinkSuspender should simulate |delay| and |delay_timestamp|

media/base/silent_sink_suspender_unittest.cc

 // Copyright 2016 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 "base/run_loop.h"
 #include "base/test/test_message_loop.h"
 #include "media/base/fake_audio_render_callback.h"
 #include "media/base/mock_audio_renderer_sink.h"
 #include "media/base/silent_sink_suspender.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 31 matching lines @@
   FakeAudioRenderCallback fake_callback_;
   std::unique_ptr<AudioBus> temp_bus_;
   SilentSinkSuspender suspender_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SilentSinkSuspenderTest);
 };
 
 TEST_F(SilentSinkSuspenderTest, BasicPassthough) {
   temp_bus_->Zero();
+  auto delay = base::TimeDelta::FromMilliseconds(20);
   EXPECT_EQ(temp_bus_->frames(),
-            suspender_.Render(base::TimeDelta(), base::TimeTicks(), 0,
-                              temp_bus_.get()));
+            suspender_.Render(delay, base::TimeTicks(), 0, temp_bus_.get()));
+
+  // Delay should remain.
+  EXPECT_EQ(delay, fake_callback_.last_delay());
   EXPECT_FALSE(temp_bus_->AreFramesZero());
 }
 
 TEST_F(SilentSinkSuspenderTest, SuspendResumeTriggered) {
   // Verify a normal Render() doesn't invoke suspend.
   EXPECT_FALSE(suspender_.is_using_fake_sink_for_testing());
   temp_bus_->Zero();
   EXPECT_EQ(temp_bus_->frames(),
             suspender_.Render(base::TimeDelta(), base::TimeTicks(), 0,
                               temp_bus_.get()));
@@ skipping 111 matching lines @@
             0);
   EXPECT_EQ(temp_bus_->frames(),
             suspender_.Render(base::TimeDelta(), base::TimeTicks(), 0,
                               temp_bus_.get()));
   EXPECT_EQ(memcmp(temp_bus_->channel(0), true_bus2->channel(0),
                    temp_bus_->frames() * sizeof(float)),
             0);
 }
 
 }  // namespace content