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PerformanceResourceTiming deliveryType explainer

This is based on w3c/resource-timing#332. See also w3c/resource-timing#343, w3c/navigation-timing#163, WICG/nav-speculation#180.

Resources on the web are usually fetched via HTTP (from the origin server), but in some cases they are known to be delivered from a cache or other buffer, in a way that affects loading performance. Insight into this is useful for authors understanding when these caches accelerate resource loading.

The deliveryType attribute on PerformanceResourceTiming addresses this, with the following values:

""

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REMIX EXAMPLE PROJECT

Remix example project is present when Remix loads very first time or there are no files existing in the File Explorer. 
It contains 3 directories:

1. 'contracts': Holds three contracts with different complexity level, denoted with number prefix in file name.
2. 'scripts': Holds two scripts to deploy a contract. It is explained below.
3. 'tests': Contains one test file for 'Ballot' contract with unit tests in Solidity.

SCRIPTS

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#!/usr/bin/env node
const crypto = require('crypto');
const http = require('http');
const https = require('https');
const fs = require('fs');

http.createServer((req, res) => {
  if (req.url !== '/') {
    res.writeHead(404);
    res.end();

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class AssociatedFrobnicator : public base::SupportsUserData::Data {
 public:
  Frobnicator* frobnicator() const { return frobnicator_; }
  void set_frobnicator(Frobnicator* frobnicator) const { frobnicator_ = frobnicator; }
 private:
  Frobnicator* frobnicator_;
};

base::SupportsUserData::Data* data;
static_cast<AssociatedFrobnicator*>(data)->set_frobnicator(new_frobnicator);

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diff --git a/third_party/blink/renderer/modules/modules_initializer.cc b/third_party/blink/renderer/modules/modules_initializer.cc
index 4eaa4575ca63..50e56db64b5b 100644
--- a/third_party/blink/renderer/modules/modules_initializer.cc
+++ b/third_party/blink/renderer/modules/modules_initializer.cc
@@ -170,6 +170,8 @@ void ModulesInitializer::InitLocalFrame(LocalFrame& frame) const {
       &AppBannerController::BindMojoRequest, WrapWeakPersistent(&frame)));
   frame.GetInterfaceRegistry()->AddInterface(WTF::BindRepeating(
       &TextSuggestionBackendImpl::Create, WrapWeakPersistent(&frame)));
+  frame.GetInterfaceRegistry()->AddInterface(WTF::BindRepeating(
+      &RemoteObjectGatewayImpl::BindMojoReceiver, WrapWeakPersistent(&frame)));

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#0  0x00007ffff79f2e10 in IPC::(anonymous namespace)::ChannelAssociatedGroupController::DetachEndpointClient(mojo::ScopedInterfaceEndpointHandle const&) (this=0x3c9213fe3aa0, handle=...) at ../../ipc/ipc_mojo_bootstrap.cc:362
#1  0x00007ffff791adf7 in mojo::InterfaceEndpointClient::~InterfaceEndpointClient() (this=0x3c921528b2e0) at ../../mojo/public/cpp/bindings/lib/interface_endpoint_client.cc:178
#2  0x00007ffff791afac in mojo::InterfaceEndpointClient::~InterfaceEndpointClient() (this=0x3c921528b2e0) at ../../mojo/public/cpp/bindings/lib/interface_endpoint_client.cc:175
#3  0x00007ffff78f949f in std::__Cr::default_delete<mojo::InterfaceEndpointClient>::operator()(mojo::InterfaceEndpointClient*) const (this=0x3c92146c28c0, __ptr=0x3c921528b2e0) at ../../buildtools/third_party/libc++/trunk/include/memory:2338
#4  0x00007ffff78f8b9d in std::__Cr::unique_ptr<mojo::InterfaceEndpointClient, std::__Cr::default_delete<mojo::InterfaceEndpointClient> >::reset(mojo::InterfaceEndpointClient*) (this=0x3c92146c28c0, __p

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PlatformPaintWorkletInput(
  Vector<std::pair<CSSPropertyID, String>> native_values)
  : native_values_(std::move(native_values)) {
    
    for (auto& pair : native_values_) {
      String& s = pair.second;
      if (!s.IsSafeToSendToAnotherThread())
        s = s.IsolatedCopy();
    }
}

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diff --git a/content/browser/web_package/web_package_context_impl.cc b/content/browser/web_package/web_package_context_impl.cc
index ea3956d77739..86367c49ad54 100644
--- a/content/browser/web_package/web_package_context_impl.cc
+++ b/content/browser/web_package/web_package_context_impl.cc
@@ -4,40 +4,19 @@
 
 #include "content/browser/web_package/web_package_context_impl.h"
 
-#include "base/bind.h"
-#include "base/single_thread_task_runner.h"

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namespace blink {

class RealClass : public RealBase {
 public:
  static RealClass* Create();
  void DoSomething();
 private:
  // members here
};

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// template definition
template <int index, typename... UnionMemberTraits>
class IDLUnionImpl {
 public:
  bool IsNull() const { return type_ == 0; }

 protected:
  int type_ = 0;
};
template <int index, typename UnionMemberTraits, typename... Rest>