9849 Preserve the alpha for VD content by setting a transparent background. (cla: yes)

9850 Add multi-line flag to semantics (cla: yes)

9851 Add a macro for prefixing embedder.h symbols (cla: yes)

9852 Selectively enable tests that work on Windows and file issues for ones that don’t. (cla: yes)

9855 Fix missing assignment to _allowHeadlessExecution (cla: yes)

9856 Disable Fuchsia Debug & Release presubmits and only attempt the Profile unopt variant. (cla: yes)

9857 Fix fuchsia license detection (cla: yes)

9859 Fix justify for RTL paragraphs. (cla: yes, waiting for tree to go green)

9866 Update buildroot to pick up Fuchsia artifact roller. (cla: yes)