[skottie] Fix font fallback in viewer and skottie_tool

After https://skia-review.googlesource.com/c/skia/+/782356 we need an
explicit font manager for font fallback to work.

Change-Id: I04d67a0ec0caee18ac230fded199f237722ff6e6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/798676
Reviewed-by: Ben Wagner <[email protected]>
Commit-Queue: Florin Malita <[email protected]>
Reviewed-by: Jorge Betancourt <[email protected]>

modules/skottie/src/SkottieTool.cpp

@@ -500,6 +500,7 @@ int main(int argc, char** argv) {
     //   - we need to know its duration upfront
     //   - we want to only report parsing errors once
     auto anim = skottie::Animation::Builder()
+            .setFontManager(fontMgr)
             .setLogger(logger)
             .setResourceProvider(rp)
             .make(static_cast<const char*>(data->data()), data->size());

modules/skottie/src/layers/TextLayer.cpp

@@ -244,7 +244,7 @@ bool AnimationBuilder::resolveNativeTypefaces() {
         }
         if (!finfo->fTypeface && !fFontMgr) {
             this->log(Logger::Level::kError, nullptr,
-                      "Could not load typeface for %s|%s becuase no SkFontMgr provided.",
+                      "Could not load typeface for %s|%s because no SkFontMgr provided.",
                       finfo->fFamily.c_str(), finfo->fStyle.c_str());
         }
     });

tools/viewer/SkottieSlide.cpp

@@ -533,6 +533,7 @@ void SkottieSlide::init() {
     auto text_tracker = sk_make_sp<TextTracker>(fTransformTracker);
 
     builder.setLogger(logger)
+           .setFontManager(ToolUtils::TestFontMgr())
            .setPrecompInterceptor(std::move(precomp_interceptor))
            .setResourceProvider(resource_provider)
            .setPropertyObserver(text_tracker);