Roll external/skia 1811d1615..7635013ad (9 commits)
https://skia.googlesource.com/skia.git/+log/1811d1615..7635013ad
2019-06-20 nifong@google.com Deserialize MultiPictureDocument based SKP files (with image sharing proc) in wasm debugger.
2019-06-20 reed@google.com runtime shaders
2019-06-20 jvanverth@google.com Switch Metal dynamic buffer allocations to use a ring buffer.
2019-06-20 bsalomon@google.com Revert "Revert "Make SkASSERT not break build in constexpr GrSwizzle method on GCC""
2019-06-20 rmistry@google.com [lottie-web-perf] Add LottieWeb CPU and GPU bots
2019-06-20 mtklein@google.com forward-declare Program::Instruction
2019-06-20 robertphillips@google.com Fix up wacky_yuv_formats GM and GL caps
2019-06-20 mtklein@google.com no -ffoo-sections on Darwin
2019-06-20 rmistry@google.com Rename recipe from perf_skottie_wasm to perf_skottiewasm_lottieweb
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Change-Id: Ieea0ca55327986b0284d19ae632b817272268daf
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