Move underflow threshold limits out of the video renderer.

media/renderers/video_renderer_impl_unittest.cc

 // Copyright 2013 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 <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/debug/stack_trace.h"
@@ skipping 493 matching lines @@
   // Advance time more. Now we should signal having nothing. And put
   // the last frame up for display.
   {
     SCOPED_TRACE("Waiting for BUFFERING_HAVE_NOTHING");
     WaitableMessageLoopEvent event;
     EXPECT_CALL(mock_cb_, BufferingStateChange(BUFFERING_HAVE_NOTHING))
         .WillOnce(RunClosure(event.GetClosure()));
     EXPECT_CALL(mock_cb_, Display(HasTimestamp(10))).Times(0);
     EXPECT_CALL(mock_cb_, Display(HasTimestamp(20))).Times(0);
     EXPECT_CALL(mock_cb_, Display(HasTimestamp(30))).Times(1);
-    AdvanceTimeInMs(3000);  // Must match kTimeToDeclareHaveNothing.
+    AdvanceTimeInMs(3000);
     event.RunAndWait();
   }
 
   // Receiving end of stream should signal having enough.
   {
     SCOPED_TRACE("Waiting for BUFFERING_HAVE_ENOUGH");
     WaitableMessageLoopEvent event;
     EXPECT_CALL(mock_cb_, BufferingStateChange(BUFFERING_HAVE_ENOUGH))
         .WillOnce(RunClosure(event.GetClosure()));
     SatisfyPendingReadWithEndOfStream();
     event.RunAndWait();
   }
 
   WaitForEnded();
   Destroy();
 }
 
 }  // namespace media