Fix media timeline so that thumb never exceeds buffered data

media/filters/video_renderer_base_unittest.cc

Index: media/filters/video_renderer_base_unittest.cc
diff --git a/media/filters/video_renderer_base_unittest.cc b/media/filters/video_renderer_base_unittest.cc
index 25d002eb93ec7aee841ce32bc29d5796c53aceee..7be8f7c906fc21757c9096bed78e3833b1f2b7a7 100644
--- a/media/filters/video_renderer_base_unittest.cc
+++ b/media/filters/video_renderer_base_unittest.cc
@@ -72,6 +72,7 @@ class VideoRendererBaseTest : public ::testing::Test {
   }
 
   MOCK_METHOD0(PaintCBWasCalled, void());
+  MOCK_METHOD1(VideoTimeCBWasCalled, void(base::TimeDelta));
 
   MOCK_CONST_METHOD1(SetOpaqueCBWasCalled, void(bool));
 
@@ -100,7 +101,8 @@ class VideoRendererBaseTest : public ::testing::Test {
 
     // Initialize, we shouldn't have any reads.
     renderer_->Initialize(decoder_,
-                          NewExpectedClosure(), NewStatisticsCallback());
+                          NewExpectedClosure(), NewStatisticsCallback(),
+                          NewVideoTimeCallback());
 
     // Now seek to trigger prerolling.
     Seek(0);
@@ -244,6 +246,11 @@ class VideoRendererBaseTest : public ::testing::Test {
                       base::Unretained(&stats_callback_object_));
   }
 
+  VideoRenderer::VideoTimeCB NewVideoTimeCallback() {
+    return base::Bind(&VideoRendererBaseTest::VideoTimeCBWasCalled,
+                      base::Unretained(this));
+  }
+
   // Fixture members.
   scoped_refptr<VideoRendererBase> renderer_;
   scoped_refptr<MockVideoDecoder> decoder_;