• Andreas Haas's avatar
    [wasm] Check the isolate if WebAssembly threads are enabled. · 1408e127
    Andreas Haas authored
    With the origin trial for WebAssembly threads, threads can be turned on
    and off by the embedder depending on the context we are currently in.
    With this CL we call the embedder callback stored on the isolate to
    determine whether threads are enabled in the current context or not.
    
    Design decision:
    I decided to extend the {WasmFeaturesFromIsolate} function to ask the
    embedder if WebAssembly threads are enabled. This is the function which
    defines dynamically which features are turned on. It would be awkward
    to have two such functions, one which calls the embedder and one which
    does not.
    A downside is that in WasmJs::Install the embedder does not seem to be
    ready to be called. That's why I changed the code there to call
    {WasmFeaturesFromFlags} instead.
    
    R=titzer@chromium.org, mstarzinger@chromium.org
    
    Bug: chromium:868844
    Change-Id: I6bfa89960a54cec71992756e3717bbb3a9fe195e
    Reviewed-on: https://chromium-review.googlesource.com/1169180
    Commit-Queue: Andreas Haas <ahaas@chromium.org>
    Reviewed-by: 's avatarBen Titzer <titzer@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#55076}
    1408e127
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