From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jeremy Apthorp <nornagon@nornagon.net>
Date: Wed, 15 Jan 2020 16:35:18 -0800
Subject: add DidInstallConditionalFeatures

This adds a hook on script context creation _after conditional features
have been installed_. Electron uses this to run preload scripts and
various other initialization. This is necessary because at the time
DidCreateScriptContext is called, not all JS APIs are available in the
context, which can cause some preload scripts to trip.

diff --git a/content/public/renderer/render_frame_observer.h b/content/public/renderer/render_frame_observer.h
index f63b17435218d0d67bba044da67c1c80015fc996..d0fe24182f2cb48a1333054ce44b6a7f49b2f053 100644
--- a/content/public/renderer/render_frame_observer.h
+++ b/content/public/renderer/render_frame_observer.h
@@ -116,6 +116,8 @@ class CONTENT_EXPORT RenderFrameObserver : public IPC::Listener,
   virtual void DidHandleOnloadEvents() {}
   virtual void DidCreateScriptContext(v8::Local<v8::Context> context,
                                       int32_t world_id) {}
+  virtual void DidInstallConditionalFeatures(v8::Local<v8::Context> context,
+                                             int32_t world_id) {}
   virtual void WillReleaseScriptContext(v8::Local<v8::Context> context,
                                         int32_t world_id) {}
   virtual void DidClearWindowObject() {}
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index f7feec16308f9fe8d49c3e6a15765eb86153e683..3a01380b4fc373f41d631f585d4576b10129b130 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -5004,6 +5004,12 @@ void RenderFrameImpl::DidCreateScriptContext(v8::Local<v8::Context> context,
     observer.DidCreateScriptContext(context, world_id);
 }
 
+void RenderFrameImpl::DidInstallConditionalFeatures(
+    v8::Local<v8::Context> context, int world_id) {
+  for (auto& observer : observers_)
+    observer.DidInstallConditionalFeatures(context, world_id);
+}
+
 void RenderFrameImpl::WillReleaseScriptContext(v8::Local<v8::Context> context,
                                                int world_id) {
   for (auto& observer : observers_)
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index dffe4596a0bd88124017177795390c2db1b574b2..7dfbb18e6a1701224c6cb0231a1f67e7c6251b91 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -706,6 +706,8 @@ class CONTENT_EXPORT RenderFrameImpl
   bool ShouldTrackUseCounter(const blink::WebURL& url) override;
   void DidCreateScriptContext(v8::Local<v8::Context> context,
                               int world_id) override;
+  void DidInstallConditionalFeatures(v8::Local<v8::Context> context,
+                                     int world_id) override;
   void WillReleaseScriptContext(v8::Local<v8::Context> context,
                                 int world_id) override;
   void DidChangeScrollOffset() override;
diff --git a/third_party/blink/public/web/web_local_frame_client.h b/third_party/blink/public/web/web_local_frame_client.h
index cba17ff34e880de151c8fc30563da5c1ba0e4a88..4249b961b0d4361d4b13440ecd6e470b7142ed00 100644
--- a/third_party/blink/public/web/web_local_frame_client.h
+++ b/third_party/blink/public/web/web_local_frame_client.h
@@ -543,6 +543,9 @@ class BLINK_EXPORT WebLocalFrameClient {
   virtual void DidCreateScriptContext(v8::Local<v8::Context>,
                                       int32_t world_id) {}
 
+  virtual void DidInstallConditionalFeatures(v8::Local<v8::Context>,
+                                             int32_t world_id) {}
+
   // WebKit is about to release its reference to a v8 context for a frame.
   virtual void WillReleaseScriptContext(v8::Local<v8::Context>,
                                         int32_t world_id) {}
diff --git a/third_party/blink/renderer/bindings/core/v8/local_window_proxy.cc b/third_party/blink/renderer/bindings/core/v8/local_window_proxy.cc
index be4c8053f2bc5e2ad9da6a038a1a70edb37656c9..953e436fc09e9afa2189ad2ebdfdb085cabe51a7 100644
--- a/third_party/blink/renderer/bindings/core/v8/local_window_proxy.cc
+++ b/third_party/blink/renderer/bindings/core/v8/local_window_proxy.cc
@@ -203,6 +203,7 @@ void LocalWindowProxy::Initialize() {
   }
 
   InstallConditionalFeatures();
+  GetFrame()->Client()->DidInstallConditionalFeatures(context, world_->GetWorldId());
 
   if (World().IsMainWorld()) {
     GetFrame()->Loader().DispatchDidClearWindowObjectInMainWorld();
diff --git a/third_party/blink/renderer/core/exported/local_frame_client_impl.cc b/third_party/blink/renderer/core/exported/local_frame_client_impl.cc
index f46bec1838788df47ca8c6290028361be89695b2..ff7f45078ec1c8508c22861f7bca9281cd1b51a8 100644
--- a/third_party/blink/renderer/core/exported/local_frame_client_impl.cc
+++ b/third_party/blink/renderer/core/exported/local_frame_client_impl.cc
@@ -392,6 +392,13 @@ void LocalFrameClientImpl::DidCreateScriptContext(
     web_frame_->Client()->DidCreateScriptContext(context, world_id);
 }
 
+void LocalFrameClientImpl::DidInstallConditionalFeatures(
+    v8::Local<v8::Context> context,
+    int32_t world_id) {
+  if (web_frame_->Client())
+    web_frame_->Client()->DidInstallConditionalFeatures(context, world_id);
+}
+
 void LocalFrameClientImpl::WillReleaseScriptContext(
     v8::Local<v8::Context> context,
     int32_t world_id) {
diff --git a/third_party/blink/renderer/core/exported/local_frame_client_impl.h b/third_party/blink/renderer/core/exported/local_frame_client_impl.h
index f4b653a52cdf0bb71e3cdc3f090c1a5f044282e3..d9d7f15cdad4edde0d27671d66beb5d1d9735079 100644
--- a/third_party/blink/renderer/core/exported/local_frame_client_impl.h
+++ b/third_party/blink/renderer/core/exported/local_frame_client_impl.h
@@ -77,6 +77,8 @@ class CORE_EXPORT LocalFrameClientImpl final : public LocalFrameClient {
 
   void DidCreateScriptContext(v8::Local<v8::Context>,
                               int32_t world_id) override;
+  void DidInstallConditionalFeatures(v8::Local<v8::Context>,
+                                     int32_t world_id) override;
   void WillReleaseScriptContext(v8::Local<v8::Context>,
                                 int32_t world_id) override;
 
diff --git a/third_party/blink/renderer/core/frame/local_frame_client.h b/third_party/blink/renderer/core/frame/local_frame_client.h
index ca739d620185e7e771f563d1a94bc5fb4fa129b7..94a23f135e628500be38dd5b468ce3513e968f92 100644
--- a/third_party/blink/renderer/core/frame/local_frame_client.h
+++ b/third_party/blink/renderer/core/frame/local_frame_client.h
@@ -290,6 +290,8 @@ class CORE_EXPORT LocalFrameClient : public FrameClient {
 
   virtual void DidCreateScriptContext(v8::Local<v8::Context>,
                                       int32_t world_id) = 0;
+  virtual void DidInstallConditionalFeatures(v8::Local<v8::Context>,
+                                             int32_t world_id) = 0;
   virtual void WillReleaseScriptContext(v8::Local<v8::Context>,
                                         int32_t world_id) = 0;
   virtual bool AllowScriptExtensions() = 0;
diff --git a/third_party/blink/renderer/core/loader/empty_clients.h b/third_party/blink/renderer/core/loader/empty_clients.h
index 50beea038e1cf928ea18cac3e0a4071ca7686cc4..d47a028bdcdf67b892ce82a9d9660e1fb8ddb760 100644
--- a/third_party/blink/renderer/core/loader/empty_clients.h
+++ b/third_party/blink/renderer/core/loader/empty_clients.h
@@ -325,6 +325,8 @@ class CORE_EXPORT EmptyLocalFrameClient : public LocalFrameClient {
 
   void DidCreateScriptContext(v8::Local<v8::Context>,
                               int32_t world_id) override {}
+  void DidInstallConditionalFeatures(v8::Local<v8::Context>,
+                                     int32_t world_id) override {}
   void WillReleaseScriptContext(v8::Local<v8::Context>,
                                 int32_t world_id) override {}
   bool AllowScriptExtensions() override { return false; }