Merge pull request #311 from w3c/optimize

Add optimizeForLatency to the spec.

index.src.html

@@ -1631,6 +1631,7 @@
   [EnforceRange] unsigned long displayAspectWidth;
   [EnforceRange] unsigned long displayAspectHeight;
   HardwareAcceleration hardwareAcceleration = "allow";
+  boolean optimizeForLatency;
 };
 </xmp>
 
@@ -1688,7 +1689,7 @@
     Vertical dimension of the VideoFrame's aspect ratio when displayed.
   </dd>
 
-Note: {{VideoFrame/displayWidth}} and {{VideoFrame/displayHeight}} can both be
+  NOTE: {{VideoFrame/displayWidth}} and {{VideoFrame/displayHeight}} can both be
   different from {{VideoDecoderConfig/displayAspectWidth}} and
   {{VideoDecoderConfig/displayAspectHeight}}, but they should have identical
   ratios, after scaling is applied when
@@ -1699,6 +1700,17 @@
     Configures hardware acceleration for this codec. See
     {{HardwareAcceleration}}.
   </dd>
+
+  <dt><dfn dict-member for=VideoDecoderConfig>optimizeForLatency</dfn></dt>
+  <dd>
+    Hint that the selected decoder SHOULD be configured to minimize the number
+    of {{EncodedVideoChunk}}s that have to be decoded before a {{VideoFrame}}
+    is output.
+
+    NOTE: In addition to User Agent and hardware limitations, some codec
+    bitstreams may require a minimum number of inputs before any output can be
+    produced.
+  </dd>
 </dl>