cc: Fix PaintImage serialization for empty images.

R=enne@chromium.org

Bug: 84706
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Idf3ce80d9c9a63ac651b03c6dacb0002b659445a
Reviewed-on: https://chromium-review.googlesource.com/1101957Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568223}

cc/paint/paint_op_writer.cc

@@ -252,6 +252,11 @@ void PaintOpWriter::Write(const DrawImage& draw_image,
 }
 
 void PaintOpWriter::WriteImage(uint32_t transfer_cache_entry_id) {
+  if (transfer_cache_entry_id == kInvalidImageTransferCacheEntryId) {
+    Write(static_cast<uint8_t>(PaintOp::SerializedImageType::kNoImage));
+    return;
+  }
+
   Write(
       static_cast<uint8_t>(PaintOp::SerializedImageType::kTransferCacheEntry));
   Write(transfer_cache_entry_id);