Updates for Fuchsia roll. (#4765)

* AssetProvider
* libtxt

content_handler/app.cc

@@ -74,7 +74,8 @@ App::App() {
   if (settings.using_blink) {
     blink::SetFontProvider(std::move(font_provider));
   } else {
-    blink::FontCollection::ForProcess().GetFontCollection()->PushFront(
+    blink::FontCollection::ForProcess().GetFontCollection()->
+        SetAssetFontManager(
             sk_make_sp<txt::FuchsiaFontManager>(std::move(font_provider)));
   }
 

content_handler/runtime_holder.cc

@@ -411,8 +411,8 @@ void RuntimeHolder::HandlePlatformMessage(
 }
 
 void RuntimeHolder::DidCreateMainIsolate(Dart_Isolate isolate) {
-  if (directory_asset_bundle_) {
-    blink::AssetFontSelector::Install(directory_asset_bundle_);
+  if (asset_provider_) {
+    blink::AssetFontSelector::Install(asset_provider_);
   } else if (asset_store_) {
     blink::AssetFontSelector::Install(asset_store_);
   }
@@ -504,7 +504,7 @@ void RuntimeHolder::InitRootBundle(std::vector<char> bundle) {
       FXL_LOG(ERROR) << "Unable to load data dir";
       return;
     }
-    directory_asset_bundle_ =
+    asset_provider_ =
         fxl::MakeRefCounted<blink::DirectoryAssetBundle>(std::move(data_dir));
   }
 }
@@ -532,8 +532,8 @@ bool RuntimeHolder::HandleAssetPlatformMessage(
 
 bool RuntimeHolder::GetAssetAsBuffer(const std::string& name,
                                      std::vector<uint8_t>* data) {
-  return (directory_asset_bundle_ &&
-          directory_asset_bundle_->GetAsBuffer(name, data)) ||
+  return (asset_provider_ &&
+          asset_provider_->GetAsBuffer(name, data)) ||
          (asset_store_ && asset_store_->GetAsBuffer(name, data));
 }
 

content_handler/runtime_holder.h

@@ -11,6 +11,7 @@
 #include <unordered_set>
 
 #include "dart-pkg/fuchsia/sdk_ext/fuchsia.h"
+#include "flutter/assets/asset_provider.h"
 #include "flutter/assets/directory_asset_bundle.h"
 #include "flutter/assets/unzipper_provider.h"
 #include "flutter/assets/zip_asset_store.h"
@@ -115,7 +116,7 @@ class RuntimeHolder : public blink::RuntimeDelegate,
   std::vector<char> root_bundle_data_;
   // TODO(zarah): Remove asset_store_ when flx is completely removed
   fxl::RefPtr<blink::ZipAssetStore> asset_store_;
-  fxl::RefPtr<blink::DirectoryAssetBundle> directory_asset_bundle_;
+  fxl::RefPtr<blink::AssetProvider> asset_provider_;
   void* dylib_handle_ = nullptr;
   std::unique_ptr<Rasterizer> rasterizer_;
   std::unique_ptr<blink::RuntimeController> runtime_;