Support setting an explicit duration on MediaSource objects

webkit/media/webmediaplayer_impl.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/webmediaplayer_impl.h"
 
 #include <limits>
 #include <string>
 #include <vector>
 
@@ skipping 647 matching lines @@
     GetClient()->durationChanged();
 
   return true;
 }
 
 bool WebMediaPlayerImpl::sourceAbort(const WebKit::WebString& id) {
   proxy_->DemuxerAbort(id.utf8().data());
   return true;
 }
 
+void WebMediaPlayerImpl::sourceSetDuration(double new_duration) {
+  if (static_cast<double>(duration()) == new_duration)
+    return;
+
+  proxy_->DemuxerSetDuration(
+      base::TimeDelta::FromMicroseconds(
+          new_duration * base::Time::kMicrosecondsPerSecond));
+  GetClient()->durationChanged();
+}
+
 void WebMediaPlayerImpl::sourceEndOfStream(
     WebMediaPlayer::EndOfStreamStatus status) {
   DCHECK_EQ(main_loop_, MessageLoop::current());
   media::PipelineStatus pipeline_status = media::PIPELINE_OK;
 
   switch (status) {
     case WebMediaPlayer::EndOfStreamStatusNoError:
       break;
     case WebMediaPlayer::EndOfStreamStatusNetworkError:
       pipeline_status = media::PIPELINE_ERROR_NETWORK;
@@ skipping 372 matching lines @@
   return audio_source_provider_;
 }
 
 void WebMediaPlayerImpl::IncrementExternallyAllocatedMemory() {
   DCHECK_EQ(main_loop_, MessageLoop::current());
   incremented_externally_allocated_memory_ = true;
   v8::V8::AdjustAmountOfExternalAllocatedMemory(kPlayerExtraMemory);
 }
 
 }  // namespace webkit_media