Consider start time for frame painting and fix naming in test.

media/renderers/video_renderer_impl.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 "media/renderers/video_renderer_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 386 matching lines @@
   // We may have removed all frames above and have reached end of stream.
   MaybeFireEndedCallback_Locked(time_progressing_);
 
   // Paint the first frame if possible and necessary. PaintSingleFrame() will
   // ignore repeated calls for the same frame. Paint ahead of HAVE_ENOUGH_DATA
   // to ensure the user sees the frame as early as possible.
   if (!sink_started_ && algorithm_->frames_queued()) {
     // We want to paint the first frame under two conditions: Either (1) we have
     // enough frames to know it's definitely the first frame or (2) there may be
     // no more frames coming (sometimes unless we paint one of them).
+    //
+    // For the first condition, we need at least two frames or the first frame
+    // must have a timestamp >= |start_timestamp_|, since otherwise we may be
+    // prerolling frames before the actual start time that will be dropped.
     if (algorithm_->frames_queued() > 1 || received_end_of_stream_ ||
+        algorithm_->first_frame()->timestamp() >= start_timestamp_ ||
         low_delay_ || !video_frame_stream_->CanReadWithoutStalling()) {
       scoped_refptr<VideoFrame> frame = algorithm_->first_frame();
       CheckForMetadataChanges(frame->format(), frame->natural_size());
       sink_->PaintSingleFrame(frame);
     }
   }
 
   // Signal buffering state if we've met our conditions.
   if (buffering_state_ == BUFFERING_HAVE_NOTHING && HaveEnoughData_Locked())
     TransitionToHaveEnough_Locked();
@@ skipping 265 matching lines @@
 
 void VideoRendererImpl::AttemptReadAndCheckForMetadataChanges(
     VideoPixelFormat pixel_format,
     const gfx::Size& natural_size) {
   base::AutoLock auto_lock(lock_);
   CheckForMetadataChanges(pixel_format, natural_size);
   AttemptRead_Locked();
 }
 
 }  // namespace media