Improve HTMLMediaElement::currentTime()

third_party/WebKit/Source/modules/mediasource/SourceBuffer.cpp

Index: third_party/WebKit/Source/modules/mediasource/SourceBuffer.cpp
diff --git a/third_party/WebKit/Source/modules/mediasource/SourceBuffer.cpp b/third_party/WebKit/Source/modules/mediasource/SourceBuffer.cpp
index edd871b1675cf603fd6a88dcff96d588e3124db2..8c7a5b106b59df8917ca7a005545a44598095731 100644
--- a/third_party/WebKit/Source/modules/mediasource/SourceBuffer.cpp
+++ b/third_party/WebKit/Source/modules/mediasource/SourceBuffer.cpp
@@ -1157,6 +1157,13 @@ bool SourceBuffer::prepareAppend(size_t newDataSize,
 bool SourceBuffer::evictCodedFrames(size_t newDataSize) {
   DCHECK(m_source);
   DCHECK(m_source->mediaElement());
+
+  // Nothing to do if the mediaElement does not yet have frames to evict.
+  // mediaElement()->currentTime() will be NaN.
+  if (m_source->mediaElement()->getReadyState() <
+      HTMLMediaElement::kHaveMetadata)
+    return true;
+
   double currentTime = m_source->mediaElement()->currentTime();
   bool result = m_webSourceBuffer->evictCodedFrames(currentTime, newDataSize);
   if (!result) {