Suppress pause-and-buffer behavior when the HTTP response won't satisfy future requests via cache.

webkit/media/buffered_data_source.cc

 // Copyright (c) 2012 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 "webkit/media/buffered_data_source.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "media/base/media_log.h"
 #include "net/base/net_errors.h"
@@ skipping 262 matching lines @@
   playback_rate_ = playback_rate;
   loader_->SetPlaybackRate(playback_rate);
 
   if (!loader_->range_supported()) {
     // 200 responses end up not being reused to satisfy future range requests,
     // and we don't want to get too far ahead of the read-head (and thus require
     // a restart), so keep to the thresholds.
     loader_->UpdateDeferStrategy(BufferedResourceLoader::kThresholdDefer);
   } else if (media_has_played_ && playback_rate == 0) {
     // If the playback has started (at which point the preload value is ignored)
-    // and we're paused, then try to load as much as possible.
-    // TODO(fischman): except, don't do this if we can prove that the media
-    // cache is just throwing away the bits anyway.  http://crbug.com/123074
+    // and we're paused, then try to load as much as possible (the loader will
+    // fall back to kThresholdDefer if it knows the current response won't be
+    // useful from the cache in the future).
     loader_->UpdateDeferStrategy(BufferedResourceLoader::kNeverDefer);
   } else {
     // If media is currently playing or the page indicated preload=auto,
     // use threshold strategy to enable/disable deferring when the buffer
     // is full/depleted.
     loader_->UpdateDeferStrategy(BufferedResourceLoader::kThresholdDefer);
   }
 }
 
 void BufferedDataSource::SetBitrateTask(int bitrate) {
@@ skipping 281 matching lines @@
 
   if (!host())
     return;
 
   if (total_bytes_ != kPositionNotSpecified)
     host()->SetTotalBytes(total_bytes_);
   host()->SetBufferedBytes(buffered_bytes_);
 }
 
 }  // namespace webkit_media