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 103a9d9fb17e954ecaf0acecaa3eeafc23e39c94..de299316216dba204decba3b0eb57f5c277be835 100644
--- a/content/public/renderer/render_frame_observer.h
+++ b/content/public/renderer/render_frame_observer.h
@@ -139,6 +139,8 @@ 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 3829c1b7902c0fbc0bb2fb53e2917ecabdfc8e96..34b02a2d2af10c7f894ed513e82fb92c52c682d1 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4442,6 +4442,12 @@ 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 268c6c6f4b22c64ffcbaf715728e8da6f46d3b88..884b315d7fbdc57b20ee1508d352eb1e6825481e 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -611,6 +611,8 @@ class CONTENT_EXPORT RenderFrameImpl
   void DidObserveLayoutShift(double score, bool after_input_or_scroll) 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 93acf68fbb7ff9b3bfc414a33fa1cdda4fe73bb1..90ec3437c2c94e87cfd0b25b200729c14ff55683 100644
--- a/third_party/blink/public/web/web_local_frame_client.h
+++ b/third_party/blink/public/web/web_local_frame_client.h
@@ -612,6 +612,9 @@ 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 1cada05806cb35a82822507f708d43979d97de61..f8e063397b161b7501308945a7df9fb89ea7d165 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
@@ -198,6 +198,7 @@ void LocalWindowProxy::Initialize() {
   }
 
   InstallConditionalFeatures();
+  GetFrame()->Client()->DidInstallConditionalFeatures(context, world_->GetWorldId());
 
   if (World().IsMainWorld()) {
     probe::DidCreateMainWorldContext(GetFrame());
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 fb229297df448dbe48e5b0ef2978bce2a8affc83..892d971c749b5bf7499c2fc246bc9d5fe5b63b79 100644
--- a/third_party/blink/renderer/core/frame/local_frame_client.h
+++ b/third_party/blink/renderer/core/frame/local_frame_client.h
@@ -319,6 +319,8 @@ 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/frame/local_frame_client_impl.cc b/third_party/blink/renderer/core/frame/local_frame_client_impl.cc
index fa8c26e31341b2b53879a8760ad8314a569374c6..76ba9e3761d85acdaeeb017f52e24efc3d40e9b7 100644
--- a/third_party/blink/renderer/core/frame/local_frame_client_impl.cc
+++ b/third_party/blink/renderer/core/frame/local_frame_client_impl.cc
@@ -283,6 +283,13 @@ 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/frame/local_frame_client_impl.h b/third_party/blink/renderer/core/frame/local_frame_client_impl.h
index 9f6a7e8337a4ade6b902d36919bee58f5e461790..9a73f4ceb6111b7e8bcb607b4e8eb96ebbfb0d42 100644
--- a/third_party/blink/renderer/core/frame/local_frame_client_impl.h
+++ b/third_party/blink/renderer/core/frame/local_frame_client_impl.h
@@ -84,6 +84,8 @@ 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/loader/empty_clients.h b/third_party/blink/renderer/core/loader/empty_clients.h
index 6b695ab181bc7e8a8b6ecb48ca56145ddc63d6e8..4955c7246498139a20be290a48eee234de44530e 100644
--- a/third_party/blink/renderer/core/loader/empty_clients.h
+++ b/third_party/blink/renderer/core/loader/empty_clients.h
@@ -401,6 +401,8 @@ 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; }
