Fix media timeline so that thumb never exceeds buffered data

media/filters/audio_renderer_base_unittest.cc

Index: media/filters/audio_renderer_base_unittest.cc
diff --git a/media/filters/audio_renderer_base_unittest.cc b/media/filters/audio_renderer_base_unittest.cc
index 2dd5cc80c9b5dbaf7213c34177f3b79b9777e0e7..0bf6880168fa3124355c3c40ac66d0c3f068c220 100644
--- a/media/filters/audio_renderer_base_unittest.cc
+++ b/media/filters/audio_renderer_base_unittest.cc
@@ -88,11 +88,22 @@ class AudioRendererBaseTest : public ::testing::Test {
                       base::Unretained(this));
   }
 
+  void OnAudioTimeCallback(
+      base::TimeDelta current_time, base::TimeDelta max_time) {
+    CHECK(current_time <= max_time);
+  }
+
+  AudioRenderer::AudioTimeCB NewAudioTimeClosure() {
+    return base::Bind(&AudioRendererBaseTest::OnAudioTimeCallback,
+                      base::Unretained(this));
+  }
+
   void Initialize() {
     EXPECT_CALL(*renderer_, OnInitialize(_, _, _))
         .WillOnce(Return(true));
     renderer_->Initialize(
-        decoder_, NewExpectedClosure(), NewUnderflowClosure());
+        decoder_, NewExpectedClosure(), NewUnderflowClosure(),
+        NewAudioTimeClosure());
   }
 
   void Preroll() {
@@ -195,7 +206,8 @@ TEST_F(AudioRendererBaseTest, Initialize_Failed) {
   EXPECT_CALL(*renderer_, OnInitialize(_, _, _))
       .WillOnce(Return(false));
   EXPECT_CALL(host_, SetError(PIPELINE_ERROR_INITIALIZATION_FAILED));
-  renderer_->Initialize(decoder_, NewExpectedClosure(), NewUnderflowClosure());
+  renderer_->Initialize(decoder_, NewExpectedClosure(), NewUnderflowClosure(),
+                        NewAudioTimeClosure());
 
   // We should have no reads.
   EXPECT_TRUE(read_cb_.is_null());
@@ -204,7 +216,8 @@ TEST_F(AudioRendererBaseTest, Initialize_Failed) {
 TEST_F(AudioRendererBaseTest, Initialize_Successful) {
   EXPECT_CALL(*renderer_, OnInitialize(_, _, _))
       .WillOnce(Return(true));
-  renderer_->Initialize(decoder_, NewExpectedClosure(), NewUnderflowClosure());
+  renderer_->Initialize(decoder_, NewExpectedClosure(), NewUnderflowClosure(),
+                        NewAudioTimeClosure());
 
   // We should have no reads.
   EXPECT_TRUE(read_cb_.is_null());