Commits on Jan 11, 2017

1. Make script thread initiate requests for images needed by layout. …

   In support of this goal, the layout thread collects information about
   CSS images that are missing image data and hands it off to the script
   thread after layout completes. The script thread stores a list of
   nodes that will need to be reflowed after the associated network
   request is complete. The script thread ensures that the nodes are
   not GCed while a request is ongoing, which the layout thread is
   incapable of guaranteeing.
   
   The image cache's API has also been redesigned in support of this
   work. No network requests are made by the new image cache, since it
   does not possess the document-specific information necessary to
   initiate them. Instead, there is now a single, synchronous
   query operation that optionally reserves a slot when a cache
   entry for a URL cannot be found. This reserved slot is then
   the responsibility of the queryer to populate with the contents
   of the network response for the URL once it is complete. Any
   subsequent queries for the same URL will be informed that the
   response is pending until that occurs.
   
   The changes to layout also remove the synchronous image loading
   code path, which means that reftests now test the same code
   that non-test binaries execute. The decision to take a screenshot
   now considers whether there are any outstanding image
   requests for layout in order to avoid intermittent failures in
   reftests that use CSS images.

   

   jdm committed Jan 11, 2017
   24b2270

2. Fetch complete images from the cache for canvas operations.

   

   jdm committed Jan 11, 2017
   731eff6

3. Avoid dropping image requests on the ground from non-script-initiated… …

   … reflow.

   

   jdm committed Jan 11, 2017
   c68ceb3

4. Remove synchronous forks of drawImage tests, and enable proper asynch… …

   …ronous drawImage tests.

   

   jdm committed Jan 11, 2017
   203381f

5. Synchronously decode images if decoded bytes are requested after the … …

   …full response is received.

   

   jdm committed Jan 11, 2017
   e3f7d62

6. Send response for image requests progressively to image cache.

   

   jdm committed Jan 11, 2017
   1ada828

7. Extract layout image request into separate file. Do not block the doc… …

   …ument load event.

   

   jdm committed Jan 11, 2017
   bf2505f

8. Split HTMLImageElement's loading code into smaller pieces with fewer … …

   …runnables.

   

   jdm committed Jan 11, 2017

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